Yes, but that's always the risk of working at any company (and it's a risk the investor may also have if the company goes under). You can typically just get a new job and get these things back.
I think an even more compelling argument here is the one of opportunity cost when working for a startup vs big FAANG company.
Early startup tech employees not only invest their time but also lose out on real money they would have earned at another (bigger) company.