Well, FTA, you have to grow your service big first..

If you grow it big and make no money then you're likely have other problems :)

If you grow it big and make money, then you can afford to do a little filtering.

disclaimer: I'm in no way fan of this stuff.. just saying it might be as pointless as the cookie-law.

stretching out a bit here i think a chat app, that destroys "offending" content, such as [https://pastebin.com/] could be safe, but if that app allows copy pasta that might be a problem, lets say song lyrics, or movie subtitles, or leaked manuscript, or moviescripts.