The poor can only use one third of their daily income for investment.
Using one third of your income to invest in bitcoin as a poor man means that you might be investing over aggressively because you will not have much extra funds on you after taking care of your monthly expenses and needs. However, I think 10% of your income is cool to invest in bitcoin and not 33.33%.
It still all depends on how much is the poor person daily needs and discretionary income. It's his discretionary income that he can only use to invest in bitcoin so that you don't use the funds for your basic needs to buy bitcoin, because it's gambling and you will sell your bitcoin in the short run when you needs arise.
You are right; if a poor man uses 33.33% of his income and invests in bitcoin, that means he or she is already investing in bitcoin aggressively because the remaining 66.66% of his or her income will not be enough to take care of his or her monthly expenses, which might make him or her sell off his or her bitcoin to get his or her monthly expenses sorted out. Bitcoin is a long-term investment, so there's no need to be aggressive in investing in bitcoin if you know too well it stops you from sorting out your daily expenses. As a poor man, using 10% of your monthly income is the best thing to do at the moment so that you will not find it hard to solve your daily expenses, but you can increase the percentage when you have work on your monthly income to a good one, which will give you good discretionary income to invest in bitcoin and also solve your daily expenses easily.
DCA method is actually for this type of investment, where someone from a poor or middle-class family will regularly invest a percentage (no matter how small) of their income in Bitcoin. The percentage of investment will depend on the amount of their income. However, I think that a small part of the income, such as 10%, allocated for investment will be a satisfactory percentage of investment.
In the current era, the average income of every poor family is at least $150 to $200. And the average income of every middle-class family is at least $350 to $400, in this case, if a poor family invests 10% of Bitcoin on a monthly basis in DCA, its monthly Bitcoin investment will be $15 to $20, and a middle-class family's monthly investment will be $35 to $40 as 10%. But, if a middle-class person wants to invest 20% to 30% of their money, they can easily invest $100 in DCA on a monthly basis.
Therefore, it is enough to start investing this amount as their income, they can increase the percentage of investment as their income increases in the future. And thus they will continue to slowly grow their Bitcoin investment stash, and if it continues to do so in the long term (at least 10 years), they may get something better than they expected in the future, from which they will be able to improve their financial situation a lot in the future.
That is how some people use to enriched themselves in this community, because they take the advantage of dollar cost average method to continue purchasing Bitcoin from both bullish season and bearish season, because they know that before they will trade the Bitcoin the price will double up for them to achieve passive income from their holding. You don't need to have huge amount of capital before you can start using dollar cost average method to accumulate Bitcoin, because you can use any amount of funds to purchase Bitcoin but let it be in the bearish season, because that is what will make your wish to come to reality when you are about to release them for sale in the market and you will like using that method to accumulate Bitcoin. I have try it and it favour me in the past which am still using dollar cost average method to accumulate Bitcoin whenever the bearish season appear, because I have other sources of income that is making me not to sell Bitcoin in a short term.