Poor people in the real sense of that word can't even avoid to feed themselves let alone investing in Bitcoin. If someone lives below a dollar per day, how can they afford to save up to do any meaningful investment. It's almost an uphill task. I believe what is implied in your "poor people" is broke people or average earners.
That's exactly the irony of it all. I feel that to even benefit from Bitcoin, or for someone who is earning a low income, you should start with airdrops to gather up. if not for the fact that the airdrop ecosystem has been corrupted, that would have been an easy way to get money, and then we invest it into buying Bitcoin. So, currently, I don't really see how Bitcoin directly benefits the poor masses. You need to have money that you can at least use to start up your initial investment. It wouldn't just happen like that.
But bitcoin has become another source of income for the average person who can afford it