yup, what you post publicly is public. It’s the reason I find it irrational when people are complaining about X now lets blocked users see your posts. Your posts are public, people who created a fresh account can see your posts, it is already public, blocking stopping them from viewing your posts only gave you a false perception of privacy.
The only advantage of fediverse is you can choose an instance that doesn’t sell your browsing habits, other instances can only see your public actions like public posts and votes.
yup tax on empty units in general would help a lot including rent prices, if you want to not pay the extra tax, better lower your rent to a point people can afford. So the tax needs to be high enough for this decision to be made.