I remember Sam Altman posting lamenting that the most talented engineers are more interested in working for FAANG than startups. If anybody could insist on their portfolio companies' founders writing founding team friendly employment contracts, it's him.
While I'm against wealth taxes on principle, I can certainly understand the motivation for having them. I'm sure founders with fresh $100+M paychecks from acquirers can spare a few $M for those that believed in their vision enough to sacrifice the often-large opportunity cost of working for Google.
One of the reasons Woz is a personal hero of mine (alongside his engineering brilliance) is that he made sure his colleagues who toiled in their garage were treated fairly. When Jobs and Apple's investors didn't spare any would-be lucrative Apple stock for said employees, Woz made sure to "give away" some of his own to them. I'd argue Woz was still compensated quite lavishly after the "damage".
In fact, any YC startup that is currently having trouble hiring engineers might want to look into this. I would be interested in working for one that gave me more than 1% of the pie (alongside the usual "VP of Engineering" title that they always bestow to their first employee, which actually doesn't mean anything at all) as a founding eng.
EDIT: Also kudos to Cruise, which is a YC company, for actually stepping in and offering to make the founding employees whole.