We seriously need better consumer protection against Dark UI tactics.
Last I read tinder is like 70% men, and it turns out women only swipe right on the top 5% most attractive.
Do you think twitter would be dealing with 10 million twitter bots if they had a five dollar account creation fee? Do you think smurf accounts for harassment would be nearly as widespread if every ban cost the troll $5 of their real money?
There still are lots of issues with smurf accounts though, again, there's a sort of barrier to entry in that extremely new and low karma accounts can get their comments [dead]'d very trivially.
Tinder could argue that the shadow banned user is still paying to have the "Tinder Experience"... though, again, I think the difficulty would be arguing that this aligned with service expectations from the customer.
Contracts can't be completely one-sided - they must provide some sort of consideration to each party - but they can be extremely one-sided. Often times if your company is changing their vacation policy or other key employment benefit all the employees will receive a one or five dollar bonus - that bonus is because you're signing on to a contract where you're literally just giving up benefits so there's a legal requirement to give you something in exchange.
The app knows whether someone is a subscriber or not. The app should show the appropriate UI for subscribers, with detailed instructions on how to cancel their subscription. Additionally, if they have the user's phone number and/or email (they definitely do), text them and email them the cancellation instructions.