Dark pattern #2: On sign-up, you "agree to our terms of service" but then you have the gall to say, on unsubscribe: "you are currently subscribed to our opt-in messaging. Do you want to remove yourself from opt-in messaging?"
Agreeing to a 17 page terms of service document might be technically "opting in" to messaging (spam), but it sure isn't in spirit. Opting in is when you click on a, previously unchecked, check box that has "I'd like to receive marketing from you".
I'm sure there's plenty more but I uninstalled it already.