California has 7ish times the GDP with less than 5 times the population, so it would superficially have less excuses for homelessness (to be fair, it has less control because the USA extracts more tax from and dictates more policy to California than the EU does to Austria, so arguably the blame belongs at least in part at the higher level.)
USA has 340 million people and borders between states are porous. Yes..it’s indeed arguable.
The EU has 450 million people and free movement, too.
Ok. Austria is better than California and EU is greater than USA. You win. Cheers.
This is not a simple problem. Language barrier alone will prevent people from going to Austria, never mind the weather.