To badly paraphrase someone: “The idea isn’t what’s valuable, the implementation is.” That implementation is probably >90% thanks to “the help”.
Did they take a full standard salary? (Doesn't have to be SV 100k+ salaries, but standard for whatever is paid in their area). Did they do more than just code? etc etc
By your logic, the butcher who worked for market wages in a meat processing company should get a big pay day because Nestle decided to buy them.
As for entitlement, what entitles a founder to get ~50x the payout of their employees? Especially when they're also taking a SV level salary (not living in SV) and spending VC money.
Add to it the last four years of "culture" growth leading all west coast tech workers to demand you add 10% overhead to your business to advance diversity, equity, and inclusivity, which in reality is just advocation for the right kind of politics to be brought into company culture, and you get a crazy stressful soup for any founder.
Moving on to your second point about entitlement. Of course the founder is entitled to 50x the payout. You seem to be severely discounting risk. Did you see this founder's list of other failures?[1] They can pay themselves whatever they feel is right. They took the risk, failed multiple times, and finally got lucky. Of course they can reward themselves how they see fit. There are so many founders who never see the reward and end up with worse careers because they only kept founding companies rather than choosing a "stable" career. To me it seems like, in your view, the guy who didn't take the risk founding companies and got to join a "sure" job by joining a rapidly growing startup gets to be rewarded comparably to the guy who started something, working, spending years not sure where it was going to go. Why would anyone take the risk of starting a company? I'd rather join a fast growing startup if my reward is quite comparable to the founder's. Low risk, high reward.
If a founder is spending VC money and paying themselves a SV grade salary, I would have trouble calling that a significant amount of risk.