whats its mean to be kneecapped?

like, if a company's market cap gets too big, the law should stop applying to them? they should be allowed to start their own militaries and enforce martial law a la east india company?

how does a founder keep a single digit of their company after theyve been dead for a thousand years?

These arent nearly as absolute as you are making them to be.

a founder can keep their percent by paying their taxes with other money they have, or by decreasing the worth of their company. theyre a founder, they have control. Maybe founders wont be so keen to enshittify their products if theres a downside to continued growth forever. considering google dropped "dont be evil" in exchange for making larry page's 1% grow for the sake of growing, how's society at large benefiting from continuing to subsidize it?

There's also the fact that alphabet should have been broken up into about a dozen companies over a decade ago

Larry would still be rich as heck, but probably... less rich..