I believe it was Sam Altman who had proposed a good solution to this, which is that you start off with a high number like that for employee #1 with decreasing numbers as the employee count goes up. If you are Instagram and become worth $1B with only 6 employees then everyone should benefit massively. On the other hand, if it takes 1000 employees to get to a great outcome, then obviously the founders and first employees will have been diluted by the addition of all the future employees required to achieve scale or an exit.