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.
I totally forgot about this app because, well, it seemed pretty forgettable.
I’m also not in the target demo since I currently have my wallpaper set to whatever my phone wants to rotate in and out every hour from my Photos app.
It’s too trivial to remember.