Dropbox link bugs (Patreon)

I feel so shit now. Yesterday there's a asshole delete all the files in one of my dropbox link of growing diaries. Fortunately, the file can be restored, but it really wastes a lot of my time. This has happened before and I think someone remembers going into the folder and finding no files in it. But the strange thing is that the person who deleted my file is not the person I approved, nor is it in the list of Patron. It's someone I've never met before.I can only ask people who have LINK not to share it.
No matter how this happened, I already have doubts about the safety of DROPBOX.