Not everyone can afford to invest in BTC, due to lack of capital
There is an important distinction related to the point that you seem to be wanting to make, which seems to be that you are missing some nuance in regards to what makes a person able or unable to invest.
There is some correctness that if a person lacks capital, then he may well not be able to invest into bitcoin or anything else, yet the more important point would be that a person's ability to invest in bitcoin or anything else relates to the extent to which he has discretionary income.
So in that sense there is no requirement that anyone has any capital at all in order to invest into bitcoin, and so the main requirement is that a person has discretionary income - and sure, a person who has a lot of capital may well be able to invest into bitcoin by moving his capital from certain kinds of assets into bitcoin, so there could be exceptions to any proclamation - even though we already know that it is not required to have any capital to invest into bitcoin so long as you have discretionary, even though having capital could be another way to establish an investment into bitcoin.
but at least if you want and want to why not, and I agree with what you said about the DCA method which is intended for these people.
So are you admitting that there is no need for capital to invest into bitcoin?
But isn't it better to collect money first for some people who are unlucky or whose jobs are below minimum wage.
With something like bitcoin, many times it is better to get started as soon as possible, especially once you have figured out that you have discretionary income.
Now you might have a lot of messiness in your cashflows and your psychology, so you may well need to get some of those things in order, yet I would not presume that it mis necessary to get your finances and psychology in order prior to getting started in your investment into bitcoin, unless your situation happens to be so bad that you are not even able to figure out with any level of confidence whether you actually have discretionary income or not.
Even though a large number of people might have a lot of complications in their finances and perhaps even lacking in their abilities to manage their finances very well. Most likely an overwhelming number of folks should be able to tell you wether they have $100 per week or maybe $10 per week that they would be able to spare or throw away (meaning that it is extra and not needed to cover their expenses). When folks have really small amounts of extra income and a lot of disorganization in their finances, it is likely more important that they start out more slowly and that they also spend time getting their shit figured out, but that still may well not justify waiting rather than getting started right away with some small amount of discretionary income that can be figured out.
If there is no way to establish the existence of discretionary income, then those people need to make sure that they have discretionary income before they can start to invest into bitcoin.
Because if they try to invest even if it's only a little bit of what they can afford, wouldn't it hamper their finances more
Yes... if they have figured out that they actually do not have discretionary, then the should not be investing into bitcoin, because if they were to do that they would be gambling rather than investing. They need to be able to put the money into bitcoin and have a certain level of confidence that they are not going to need such money for 4-10 years or longer and also understand the risk that the amount that they put in could go to zero (meaning they could lose up to 100% of the amount that they put into bitcoin, so they have to be ready, willing and able to accept that possibility, and if they are not able to do that, then their finances and psychology is not ready to invest into bitcoin).
, and would it be more risky for their own lives, because investing is not far from the risks they will face. Isn't it better to be slow but sure to minimize something that is not wanted?
No it is not better to be slow. It is better to figure your shit out, and either you have disposable income or not. If you have disposable income, then it is better to get started investing into bitcoin as soon as possible and figure out some kind of a system.
Otherwise, if you figured out that you either do not have disposable income, then you should realize that you are not able to invest into bitcoin until you are sure that you have disposable income and then you can ONLY invest into bitcoin up to 100% of the amount of your disposable income, but if you are not sure if you have disposable income then you cannot invest into bitcoin. I would not call that waiting, but instead you either have disposable income or you do not, and if you do not have it you cannot (or should not) be investing into bitcoin, and if you are not sure if you have disposable income or not, then you are likely in the same situation of not having it.. because you need to be clear that you actually have disposable income in order to invest into bitcoin, otherwise you are gambling and not investing.
On the one hand, as their Bitcoin holdings increase, on the other hand, their wealth will also increase.
I agree with all of the points of your post, including this one, except you could have worded this part better, since you are suggesting that holding more bitcoin is going to guarantee increased wealth, which truly is not true. There is no guarantee, including that if someone does all the right things in bitcoin including investing into it as aggressively as he can, without over doing it, and he still might end up in a worse situation than if he had not invested into bitcoin... so surely it is better NOT to consider your bitcoin investment as if it were guaranteed, including communicating to others in a way that suggests that either you believe it is guaranteed or that it is guaranteed - since also you could lose your credibility when you communicate like that... even though many of us likely recognize and appreciate that it is better to invest into bitcoin rather than not investing into bitcoin, especially if we have figured out that we have discretionary income. The devil is also in the details in regards to either how much or how to go about such investing into bitcoin.