Yeah I mean, it can get diluted pretty quick right!
Say you co-found with 1-2 others, so you start at 30-51%.
You want to attract some good talent, so you give away 10% to early hires.
Each funding round you give up 15-25%.
You can see how your equity can quickly get below 10%.
Zuck managed to hold onto ~30% but your typical control is much lower these days.
Musk had 28% of Tesla at IPO. Kalanick had 8% of Uber at IPO. Foley had 6% of Peloton at IPO. Splunk 3 co-founders had 5-7.5% each at IPO. Butterfield had 8% at Slack IPO.
So you may be foregoing 10 years of $700K FAANG comp for a ~$80M payday (8% equity of $1B unicorn exit).
To me it raises the question if non-founder startup equity is basically worthless. If a founder ends up diluted down to 8% at exit, what happens to the 0.5-1% shares you get promised at hire? 0.06-0.125% ?? So your first senior engineer hire into a unicorn equity might end up worth a grand $1M at IPO? Ouch. Go grind some leetcode and work for FAANG and make that in 2 years.