Votality is indeed the main problem why borrowing will be very risky.
Maybe you mean volatility, not volatility.
Borrowing from a bank is also related to the problem of time, because loan payments will be made every month, if you are late making payments there will be a fine that is billed. Even professional traders will be at risk if they make a large loan to the bank, because the market cannot be predicted 100%, there will be some possible failures. Loans also require collateral, and the collateral will be confiscated if they cannot repay the loan.
Banks or lenders don't seem to want to know the reason why you are late paying off your monthly loan, even if they give an additional deadline then I guess you have to pay a fine. This will certainly make the trading strategy go awry and I think eventual failure is more likely.
It is better to collect money from any source even if it is small, so that you can use those savings to trade with consistent profits.
I like this idea because it's actually not too risky even though the profit is relatively small. That's fine, but some people seem to be willing to take big risks for big gains too. In trading I never do, but maybe for real business I have exceptions.