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.
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.