There are still Ko-Fi, SubscribeStar, as well as YouTube memberships. To say nothing about OnlyFans and Fansly, which have been trying to become less… porn-dependent.
Having members on YouTube doesn't impact that at all. The members will pay and discover, same as if they were on Patreon. Non-members might have a harder time discovering, but it's not like it's easy to discover content through Patreon either.