After a quick googling, Youtube takes 30% of direct memberships. And apparently Twitch takes 50% of the membership fee, reduced to 40% for its bigger channels.
It looks like Patreon will take 12% of direct memberships at the tier that lets you upload video, but Patreon is shit for discovery, especially video discovery, so it's not necessarily pure upside.
Either way, people like to parlay the fact that Youtube has a revenue share into some sort of moral justification for giving the content creators $0 on that platform.
