Apple is requiring Patreon to switch to their iOS in-app purchase system, which will result in a 30% fee on new memberships purchased through the app. This change will affect creators who use Patreon, particularly those with first-of-the-month or per-creation billing models, which will need to be migrated to subscription billing. Existing members will not be impacted by the fee. Patreon is working to make the transition as smooth as possible for creators and their fans.