Have you considered that housing might actually be valuable? If it didn’t provide value, why do you think that Vienna seized so much of it to give out to its citizens? Maybe try to find a different way to phrase whatever you’re trying to say.
Assuming you’re referring to property owners getting by doing nothing. That’s false unless they are a slumlord.
Let me ask you another question. What do people do who are not happy with the housing provided by the govt in Vienna?
> The current setup creates guettos by default, by siloing people with different monetary and social capital into different building and areas
This is not how it works in the US for the last 50 years or so. Most places force every new building to include low income units.