EDIT realise OP question is specifically about the Recommendations “Optimise” which I have never used. I have only used “Optimise“ in Settings > Account name > iCloud > Drive > Optimise and Photos app > Settings > iCloud > Optimise which give macOS permission to replace docs and photos in iCloud with pointers if space is low.
I dont want macOS removing things because I have watched them.
It is a pity macOS uses “Optimise“ for two very different things!