Unfortunately there is no way to copy a collection into your own library. If you follow the creator, although, you will see additions they make to the collection in your feed.
Viewing post in any means of saving other people's game list
didn't mean copying the list.
I was talking about something like on youtube where playlist-save just work as a shortcut link to other people's playlist.
just similar to how I can see the bundles I bought on itch.
it would be nice to save other user's collection and just access them quickly.
library page would be the most suitable place.