If startup goes to zero, then everyone goes home with nothing. The founders typically don't lose any money of their own -- that cost is shouldered by angel and series-A investors.
Often though, the startup has a "soft landing" where it's acquihired by a larger company, and then the founders typically get executive or very senior roles (with large bonuses, etc) meanwhile the non-founders get standard employee packages.
Yes, I'm glad I'm not the only one who thinks the economics of it are a little bit broken. I will never join another start up as employee #1. I'd much rather come into a larger start up with a high cash comp + equity, than very low cash comp, worked to the bone.
The other thing no one talks about is founders tend not to dilute themselves, but often early employees are diluted heavily.