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The per-creation model isn't even offered to new Patreon accounts, or those that have switched away from it. I'm not sure why

Because they've already been on the road to moving off of them for a while now (for this reason)

For what reason? iOS fees? I'm not sure they're related. Patreon has been pushing away the per-creation model for many years now.

Something about too much transaction fees?

You're aggregate-charged monthly, not individually when the work is created.