TL;DR
MKBHD is shutting down the Panels app at the end of this month, citing issues with finding the right development team fit.
You can no longer buy collections, and you must download existing wallpapers before the app is removed.
Users will receive automatic pro-rated refunds for active subscriptions, and the app code is promised to be open-sourced after shutdown.
Not for this one but hey Muzei is nice. You get new wallpapers daily (or whichever frequency you might wanna set) on anything interesting you. By default it’s art, but you can get additional plugins about whatever scratches your itch. I’m fine with it downloading daily landscapes from Bing (but without Bing getting to check at anything in my phone).
Wallhaven?
Tapet is also good for dynamically created wallpapers.I bought it a long time ago way before the current AI hype cycle.