Risk accumulates as the company operates. A risk faced by a layer 3 employee is also faced by layer 2 equity holders, even if they've left the firm.
Founder equity also compensates the founders for more than the risk that the company will fail and zero out their contributions; it also implicitly covers the upside risk of the founders, which upside was demonstrated by the fact that the founders created a company and presumably could have created others (or done something comparably lucrative) instead.
Founder equity also compensates the founders for more than the risk that the company will fail and zero out their contributions; it also implicitly covers the upside risk of the founders, which upside was demonstrated by the fact that the founders created a company and presumably could have created others (or done something comparably lucrative) instead.