It's not rocket science.
It's basic math.
If a tenant is initially qualified with the rent at 33 percent of their income or in some markets like the Bay Area, 50 percent, when the rents start going up 10, 15, 25, 30, or even 50 percent per year, assuming the vast majority of people aren't getting pay raises at nearly that level, then the tenant must:
Get roommates (if allowed by lease, difficult in tiny apartments)
Burn through all their savings
Find a cheaper place in the area (but wait that might not exist and move in costs are very high)
Apply for Section 8 (doesn't mean there will be a unit for them)
Move to a cheaper area (but then what, leave their job? Also similar increases are happening across the nation)
Couch surf / move in with friends and family / (how long will that welcome last?)
Move into car (then deal with police harassing them)
Fix up a van, etc. (then deal with police harassing them)
FULL BLOWN HOMELESSNESS (and likely premature death)
OR
If they can qualify for a visa and if they have a moveable income like social security or online remote work or perhaps a large amount of savings:
MOVE ABROAD to a country where they can afford a nice shelter and pretty much everything else, rather than live in utter misery in the U.S.
We've been talking about expats trying to not go home.
It works the other way too.
American economic refugees choosing a better quality of life abroad.
Of course expats are at the mercy of these foreign countries. They very well might not want American financial refugees. The overall international trend seems to reflect an awareness of an increase in western economic refugees and trying to repel them by raising the financial requirements. Americans abroad are certainly not legally entitled to live there without conditions (and if they act like they are entitled just because they are Americans they will quickly get a dose of hard core reality as many Americans are now rotting in horrific Mexican prisons for overstaying).
However, at this point, there are still some options.