If the founders have $1B between the two, then employee #1 would have (guesstimating) on the order of $10M, assuming the standard employee#1 == 1%. Of course there's the initial investor share and option pool to account for, but we're still in the right ballpark.

Employee #20, who joined maybe a few months in, and then put in seven years, is gonna be at order of magnitude down, $1M. Employee #50, who put in six years, is the hundred thousands, and we keep going down.

Yeah, fantastic money, but pales compared to founders.

Lesson: don't not be a founder.