I was happy a few years ago when I found a site selling DRM-free EPUBs on many topics I am interested in, but with no prior warning last week they sent out an email saying they no longer do that and instead you have to buy and read books through some special app.

They could at least have warned a few days in advance. I would have stocked up on several lifetimes of books to read. A bit skeptic about post-2022 books anyway.

Going back to kindle isn't very tempting unless there is some reliable way to export their books again. Looks like it will be going back to paper books and reading books from Gutenberg (as I do a lot anyway).