I've observed that with any piece technology where you're permitted to write / upload information and freely access it afterwards, someone will attempt to (ab)use it for file storage and write a blog article about it later :)
My favorite example of this was people storing files in "secret" subreddits by using posts and comments to store bytes. When they were later discovered by other users, the seemingly random strings sparked a huge conspiracy about their possible meaning.
However, you always have the problem that your unwilling host may remove your "files". I sometimes wonder about file storage using a textual output format that can't be distinguished from normal user interactions.
My favorite example of this was people storing files in "secret" subreddits by using posts and comments to store bytes. When they were later discovered by other users, the seemingly random strings sparked a huge conspiracy about their possible meaning.
However, you always have the problem that your unwilling host may remove your "files". I sometimes wonder about file storage using a textual output format that can't be distinguished from normal user interactions.