I've built quite large of a list of favourites linking to other people's public files. It occurred to me to test what happens to links if the original owner deletes a file. It looks like all the links just simply vanish like they were never there. So, it seems like my favourites folder, as it is, is on rather shaky ground.
I could make copies of them, of course, but that feels like it's the wrong solution.
It looks like copying a file doesn't really make a copy but it does use up the whole file worth of space from my account. It also doesn't help preserving links to the original file in case it's deleted.
What I'd prefer is a shared copy where each owner essentially only pays part of the space necessary to keep the file and keeps the file and links to it alive for everyone even if the original uploader removes it from his/her files.
The biggest problem with this approach would be that it'd, in some cases, make the cost of keeping the file fluctuate quite a bit. I suspect this would be rather rare though.
Another possible approach would be to not automatically share the cost among all owners but select someone at random from the people who have "shared" the file if the original uploader deletes it.
I noticed, that in settings you can choose between friends or everybody to be able to chat with you. Is this function already implemented or is it on the to-do list?