File this under another iPad user has not bothered to make even a minimal effort to learn how to use their iPad. Over on Threads @mrnathansi writes

I have maxed out my storage on Apple iPad air, because Apple does not allow to offload files 🤔 What is the purpose of Cloud storage then?

A screenshot of the Files app in on iPad. A file is selected and a contextual menu with various options. The top option is Remove Download

Of course this is easy to do and only requires the most minimal effort: In the Files app, long press (or two finger click with trackpad) a file that is stored in iCloud until you get the contextual menu. The very first item at the top of the menu is "Remove Download".