I worked at one in the 2010/2011 time frame where I did not, ironically one where I made no effort at all on negotiation on options and assumed the options would be worth zero. A year later Google bought us.

I didn't get "I'm retiring now" money, not even close. But consider I expected nothing, was only a senior-level IC there for a year, and remained an IC after, it made appreciable change in my life and got me a good paying job at Google after.

But I think in that case it had more to do with the parties involved (our management were great people, and Google was motivated to treat us well).

I'd love to replicate this experience, but it ain't gonna happen.