Youtube also has a subscription similar to Patreon, available only to larger creators and they take 30% off that, according to [2]. While this seems high compared to Patreon it's actually lower than Twitch that takes 50% off subscriptions.
Twitch also offer a bit system that is like a tip, and has a lower percentage.
Another datapoint is OnlyFans, used mostly for porn and takes 60%.
IMO the platforms are very distinct and their offers are fairly different. It's not a fair comparison.
[1] https://digiday.com/future-of-tv/youtube-premium-remains-sma....
[2] https://www.polygon.com/2018/6/21/17484006/channel-subscript....
For instance, see Paypal https://www.paypal.com/us/webapps/mpp/ua/acceptableuse-full
> You may not use the PayPal service for activities that:
> ...relate to transactions involving...
> ...certain sexually oriented materials or services...