I've had a Pinterest account for almost 10 years. I hadn't used it for a few years until recently, although I had accumulated a lot of pins.
So I receive an email from them saying they've removed a pin due to inappropriate, self harming content (in other words, some little troll dobbed me in). I would never pin anything harmful so I can only assume (because they didn't tell me which pin it was) that it was an album cover or something like that. They informed me that I need to go through all my pins (there are a lot!) and make sure there's no more inappropriate content or they'll 'take action'.
So I think, I'm over this, I'll just delete my account. So I do that and receive an email saying 'we'll delete your account after 14 days however, if you wish to keep you account log in before that time is up', except there's a red tab saying 'delete account' under that sentence which of course logs you back in. I then receive a flurry of emails from them saying they're reactivated my account! I finally realise it's some kind of ploy to encourage you not to delete your account and stop clicking on it.
The whole premise of Pinterest is ridiculous seeing as you can have your pins taken down for any number of petty reasons and of course, there's the whole copyright issue.