That's so unfortunate--I've also used Pocket for a decade+. I had the Omnivore app installed on my phone as a replacement for the other infinite feed scrolling apps.

I'm actually working on an open-source alternative at https://curi.ooo if you're interested in checking it out. It's a work in progress, but I'm building it primarily for my own use because I'm frustrated with all these services shutting down.

The Kobo integration you have is interesting too, wonder how I could support that use case...