I wish YC with all of its power and influence could try to change things for the better here. Early employees' blood, sweat, and tears, not to mention burning the midnight oil, often go into actualizing the founders' vision. Often these key early hires are alongside the founders working equally hard since day 10 or even day 1.
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.