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.