Maybe Bill Gates and Bezos could execute a one time rent forgiveness program from their personal values - that might even work out pretty well in the short term, but it'd be placing too high of a burden on those two in particular.
All the billionaires in America do not just have that much money just laying around. This would be a budgetary concern of the federal government. No citizens could individually pay everyone's rents.
Well, to that I'd say, if my money had anywhere near the impact of everyone's money pooled together I'd do it. Until then I'll keep advocating for public funds to be spent this way, and I assume OP would as well.
If you lend each completely broke person $100 they are still about to be completely broke and your investment will be wiped out after a brief respite. But if you hand each bankrupt person $X,000 then many might be able to dig themselves out of the hole and remain productive members of society.