Did I say mandatory? I meant optional! You’re “free” to die in a cardboard box under a freeway as a market capitalist scarecrow warning to the other ants so they keep showing up to make us more!
Except most state/local governments do have property taxes on houses, land, and cars. Not unrealistic to apply the same towards other assets. Specially since taxing homes and cars is counterintuitive because you’re taxing necessities, while taxing monetary/investment assets like stocks would make more sense to encourage more spending instead of just hoarding the money.