Prices in Vienna are so much more affordable than in comparable European cities - Munich, Hamburg, Berlin to speak of Germany, not to say Madrid, Paris, Barcelone, Milano.
Why, instead of centralised planned economy that failed ans killed millions people many times in history, not just lowering taxes and let people to decide how spend their capital individually? Game theory applied on UBI sounds really like an ugly idea.
As for tools that make citizens obey, the government already has the best one: a monopoly on the legitimate use of violence. Everything else is child’s play compared to that.