Would appreciate a feature that let's you "own" free games (so you can see them in your collection) and when they become paid versions, you could maybe grey them out and be like "If you want to continue owning this game, please pay its price to support the developer."
Viewing post in Adding free games to my Library?
Eight years later this still sounds like a good idea to me. As it is now (free games can't be added) it doesn't do the main thing I want from a manager - which is to keep tabs on the games I've installed through the platform. I mean if there's reasons to keep it this way then so be it, but then I'll uninstall the app and add the games in Playnite instead.