(2/?)
Another policy option is just to ban it outright. But that seems impolite in democracies.
A third option is to make rules that the ratio between the lowest paid and highest paid person in a company. But this is much easier to evade now than regressive taxes are, using magic accounting on digital steroids to makes money disappear and reappear as convenient.
Point being, tax policy is about incentive-shaping, as much as (sometimes more than) revenue gathering.