I agree, I think we should go back to the old system of letting them be fully private and just taxing their gains heavily to pay for the public debts/needs.
Why 50% and not 100%? The obvious answer is it creates strange incentives. Maybe something like 5% across the board for all large tech companies make sense?
Or instead, they could just continue the simple route of taxing companies via corporation tax and dividend tax without having to worry about ownership at all.
Seems to me like it creates a lot of perverse incentives.