What we need is to jail people who do exploitive shit like this. Just like any other harmful acticity we jail people for.

Or maybe jusr, OP's 50% tax deal ramps up the more acxumulated wealth and property you have. Tonstrongly discourage that practice. Like sure, you exploited your rent holdings and you are a ten millionaire. But now we are taxing you at 100% so we can bump people's UBI subsidy up enough to account for your exploitation.

Good job, you accomplished nothing in the end.