It's not guaranteed like a FAANG salary (which actually isn't completely, the past few years have seen great stock appreciation), usually it takes a few rolls of the dice, but it's just not accurate to describe it as a definite 0. Startup selection ability pays a serious role here, I've seen people whose picks I shake my head at consistently, and some people who can home in on successful ones like heatseeking missiles. If you're the type to take the story of a business person about lofty valuations and prospects at face value, though, you're probably going to have a bad time and end up bitter and talking about how bad a deal startups are on the internet.
But basically, you really need to do your homework and treat it like you’re making an investment.
