It's just because of power. SpaceX for example is set up in a way where only Musk can fire himself lol. Same with Meta, Zuckerberg has disproportionate voting shares to protect himself from BOD trying to oust him. For Epstein, the current US President is implicated in those so he's using his power to protect himself and others too because if he lets them face investigation and prosecution over their inclusion, naturally he'll be next. In the UK the royal family holds way less power so they threw Andrew to the wolves because he's a second-tier royal anyway. He was way down the succession chain. If he was next in line to be king they'd probably have tried to protect him too.
Jensen Huang didn't hold enough power in Nvidia to protect himself from this kind of shit. He owned shares but didn't have a majority. Also the affairs here are not just affairs. The first affair is literally part of what seems to be a smuggling operation to sell their shit to China despite not being allowed to by the US government, and the second affair is an abuse of power because he is literally the boss of the woman he was sleeping with. Even when it is consensual, that kind of shit is never ok in companies. If he had just slept around with two 20-year old groupies outside the company he would still be CEO right now. Board of directors wouldn't have cared.