Capitalism has nothing to do with fewer or more companies. A founder can currently be rewarded as much as 1000000X than an average employee simply because the arrangement is that employee gets paid for time (a highly limited quantity) while founder gets paid for capital (virtually unlimited quantity). Assume that you forced founders not to capture all of the capital gains generated by employees such that the founder was rewarded "only" 1000X more than average employee. I don't think this is so badly under-rewaeded that founders will just stop being founders.

A founder that's rewarded 1000000X is cashing in on a lottery ticket. That's all there is to it. Just as in most lotteries, even most founders are losers.