In Silicon Valley companies at least, founders are not pouring their life savings into companies, paying for employees out of pocket until they reach revenue. No, the only real difference between founders and early employees is:
- The founders had the original idea / area to work in (usually not very well-defined yet).
- The founders raised capital. Yes, this takes some number of unpaid weeks or months, toiling deep in the mines of Palo Alto coffee shops.
And yes, they do a bit more than that, but that's the essence. Then you hire your first few people and off you go.
Founders believe that effort is worth 10-100X more than early employees' contribution, and at least 1000X more than the later ones. Employees, often unaware of how lopsided their equity is, go into it believing they're "in it together!" with the founders.