You know, there seems to be a hidden thought here that it's either just (A) let the Founders do their thing and of course they will provide great value and happen to become billionaires as a result or (B) tax those crooked cheaters who are taking our wealth.

There could be alternatives. For example, laws that ensure ownership of said companies is more widely held, so that the wealth is more evenly distributed among those who created it, for instance.