However, this company was a few stages before IPO so there could have been less dilution from investors - allowing the founders to get a bigger cut.
On the other hand, some investors have really aggressive terms that can screw founders in situations like this. For example, their contracts could stipulate that an investor gets the first $45m of any exit even if that investor only put $15m into the company.
The "20%" case is typically the best case that happens only in the 1/10,000 chance of extreme fast growth into a new behemoth, OR where the founders are already high net worth individuals or come from high net worth families, and can provide their own money in conjunction with VCs instead of relying on them for most capital.
Because this is all private and not discussed, we tend to only hear of the very exceptional cases, and ignore the vast majority of the non-lottery winners in the startup world.
According to a lawyer who setup our initial investments, this was actually illegal so common investors including myself sued, but was this bankrolled by one of the big early investors as it's incredibly expensive to try and do a shareholder lawsuit against a major VC firm and investment bank. It ended up being settled out of court and that's where my $100,000 came from. The CEO came out a little better, but people who sweated years (and I mean frequent all nighters, weekends, true dedication) ended up with even less than me. And the only reason we even received anything at all was because we had a HNWI common investor who also got screwed and backed the lawsuit, they ended up getting their money back and a small return on investment from what I remember of the settlement terms.
Just a word of caution to founders and early employees of startups to know what they are getting in to and the typical case of what happens (a small or non existent exit is the typical case in a tech startup), even when you see those big number raises and a big sale and you just assume that everyone is making bank.
Because of the settlement terms I'm not able to name the VC, but I can tell you this kind of behavior is by no means unique to this VC, in fact it's rather de rigueur for the VC and PE worlds. It's even defensible in a way, they owe fiduciary duty to their limited partners, NOT to the common shareholders of the company they invest in.
I currently advise startups seeking financing to either a) only go the VC route if you think you're in megagrowth into the next dropbox et. all or b) you have enough self/family wealth to take VC investment on favorable terms ala stripe.
Thanks for providing insight to the process, very fascinating.