This is a non-issue; the stock will temporarily lose a bit of value through the increase of supply and that's it. Amazon as a company would still intrinsically be valued at hundreds of billions if not 1+ trillion, even if Bezos were to die tomorrow and his will would say that all of his shares should be sold on the market within a day. The fact that you might only end up redistributing $70 billion instead of the $80 billion he was worth when alive doesn't matter, it's still $70 billion being redistributed.

Who says you have to sell it? It could be held by the taxpayer, and they could pocket the dividends.

Not saying I support this kind of action, but I don't think this is a good argument against it.

Laws that force Bezos to open up his platforms to competition would likely collapse the share price while not killing the actual value of what was built.

Tax is another.

The problem is getting into a position where you could pass those laws without violence. I'm not sure it is possible to do it democratically in such a corrupted political system. 3rd parties are essentially impossible and oligarchs have a lock on the other 2.

You disable his AWS account and badge and stop inviting him to meetings, likewise for any other hands that that stock falls into. It's not valuable if it doesn't give the holder enough power to make changes happen.