I don't think taking loan to invest in cryptocurrency. Trading in general is a risky game so there is no point to advice someone to take loan for crypto investment, it's a rule not to invest the amount you can't avoid to loose, and loaned money will not give proper mindset. Cryptocurrency market is not really predictable, so taking loan to trade is not a good advice.
I once tried to borrow money from a bank as investment capital in crypto, but it didn't meet my expectations. The price of the coins I bought
keeps dropping, while I have to pay my loan installments regularly every month. Finally I experienced financial problems, because the money
to buy daily needs I had to use to pay off debts. Like you said the crypto market is very difficult to predict, so it's not a good idea to borrow money
to invest in crypto. It's better if we invest with small capital, but from the extra money we have, so in the future there will be no financial problems
if the market does not match our expectations.
That's the risk of borrowing money for investment if it doesn't match expectations, and having to pay according to the agreement is very uncomfortable if our finances are not good.
Never risk certainty with uncertainty, because investment is uncertainty that does not necessarily match expectations, it would be better if you borrow money for urgent or very important purposes such as for treatment due to illness or other.
Invest according to your ability even in small amounts, do not force what is not in accordance with the circumstances, borrow money for investment because you will face two risks, loss if your investment fails and still repay your loan under any circumstances.
Wawa2013's description of what happened to him, shows that none of us should be borrowing to invest in something that is uncertain, unless we also have funds (cashflow) in which we are able to pay back the loan in the event that our investment does not go in the direction that we had hoped.
Let me be clear, I do agree with the overall power of using debt to leverage getting rich faster than you might otherwise be able to, as OP is proposing, but if we are attempting to apply this question to crypto for sure, I would not recommend to invest in any kinds of shitcoins or various crypto projects whether by loan or otherwise, unless you are really clear about the value proposition in the various shitcoins.. in other words, I see every single project other than bitcoin to have too many risks, so I would not invest in them.
On the other hand, I recommend to invest in bitcoin.. especially on at least a 4 year timeline or greater.. sure 10 years or longer would even be better.
For sure, in the short-term there can be some uncertainties regarding BTC's price direction, so that is a risk that anyone using leverage (debt) would need to be willing to take. In that regard, there would be a need and ability to be able to ride out potential ups and downs of the BTC price along the way, even though it seems quite likely that BTC prices are going to be up 4 years from now, but not so certain on shorter time horizons.. even possible that we will never be able to get BTC for these low $40k prices ever again... ..
Let's say for example, we were able to get a loan for $22k with a 5 year payback horizon and a 6% interest rate. That would allow us to buy right around 0.5 BTC right now, and our servicing of such $22k debt would cost $432 per month (and by the way, a 5-year loan for $22k at 6% per annum that is serviced over the full-term would end up costing $3,459 - so the total payback would be $25,459).
Even if we might not be clear about the short term price direction of BTC, we might still believe that it is better to buy 0.5 bitcoin and pay 6% per year on that debt for the next five years instead of taking a chance that we are not able to buy BTC as cheap because we believe that BTC prices might go up by more than 6% per year.. perhaps even 12% or 50% per year.
So, if we have resources to be able to pay back the loan at $432 per month, we feel that we may well be able to get more bitcoin by getting such $22k loan now rather than to buy BTC at $432 per month for the next 5 years with that same money. Our bet pays off if BTC performs greater than the amount of our loan over that same period of time, so if BTC performs at equal to or less than 6% per year, then we would not have gotten any extra value out of locking in the purchase of 0.5 BTC right away rather than just buying $108 of BTC per week with our loan payment amounts.
Of course, if BTC were to end up performing better than 6% per year over that time, then we end up getting surplus value out of the loan and we were able to get more BTC than we would have otherwise been able to get if we had not relied upon the loan.
Even though I am NOT against using debt to finance various kinds of speculation (or investment in something like BTC), the calculation that each person needs to take would be to calculate and account for would be what are the odds that the loan could make you better off than if you had not taken the loan, and surely if you do not take the loan, you still could dedicate that money to investing in bitcoin, but the investment ends up getting spread over 5 years rather than being able to invest to buy 0.5 BTC (as in the example) right now. Of course, I do not believe in relying on the proceeds of the investment to be able to pay off the loan, even though that could be a benefit if a greater than expected (or at least way higher than 6% per year) upside scenario were to play out... which also does happen from time to time and front loading your investment with 0.5 BTC extra now may well put you in a better position to benefit from any exponential upside scenario that could take place within the terms of the loan rather the slower investment style that would end up causing you to not be able to get as many BTC because they end up costing potentially exponentially more later.
By the way, another thing with BTC is that I tend to recommend that newbie normies do not even need to be taking a lot of risk when they get into BTC, so sure if they can get a loan, they might consider doing that, but if it is too burdensome and complicated or stressful for them, they can just do what they can and invest as much as they reasonably can over 4-10 years or longer, and even if it ONLY ends up being $10 per week, or even as aggressively as $108 per week, like in the hypothetical payments, you likely are still going to benefit stupendously over a longer timeframe such as 4-10 years because bitcoin remains an asymmetrical bet to the upside that is likely going to continue to even benefit people of modest means who are persistent and longer term with their investment.