Patreon sent an email telling me about some changes to the way posts go to different tiers.
They sent several templates for a message explaining it to subscribers. I couldn't make sense of it.
So I'm going to do what I should have done back with the fee fiasco almost exactly one year ago and set up an alternative on a service with a much more clear sense of what they're doing. This is what I've done with Gumroad's membership feature: https://gumroad.com/l/DigitalScofflaw