I don't support the wealth tax, but this is too simplistic coming from paul (probably meant to be, to hide the facts).
The real picture is incorporating stock growth and probably calculating a $ amount. If you are a founder that made it, and your stock is growing and growing, you can easily take a loan and pay it without having to sacrifice the equity.
Also let's not forget 83B is a thing, and let's you opt in to practically having LTCG on grant price instead of vest price. If you have a vest schedule for founders, with this calculation, income tax is worse than the wealth tax, probably, under STCG.
The real picture is incorporating stock growth and probably calculating a $ amount. If you are a founder that made it, and your stock is growing and growing, you can easily take a loan and pay it without having to sacrifice the equity.