Also what i find very interesting about this topic is how demographics plays into this

i personally think that the UN predictions about how the population numbers are going to evolve are utter bullshit. it is well known that the population pyramid looks something like this:

and it's going to get thinner and thinner at the bottom as time progresses.

anyways, i think a lot of organizations that could build housing are a bit reluctant mostly for that reason. a company thinks "if i build a house today, there's a good chance that there won't be demand for that house in 30 years, so it might not pay off". and municipalities, i'm afraid, are way too under-invested in building social housing in general because that would be communism or sth.

after a quick search on the internet, about 1.6 million people live in public housing in the US in 2024. that's about 0.5 percent. Source

Meanwhile in Europe, about 9.3% (45 million people) people live in public housing according to this article, with some countries like Austria having 24%. (8% of EU according to this OECD study).