I mean, Tortious interference can apply when a service which could reasonably have been expected to charge reasonable amounts suddenly increases their prices for no reason, if it prevents a third party from being able to fulfill a contract. I have no idea if one of this is one of those cases though, I wouldn't expect so but IANAL.
Reddit lawyers would show other social networks such as Twitter and Imgur offical pricing charging more. That would make it a reasonable amount. And there is a reason, they're unprofitable. It really annoys me that people say the price is unreasonable when it's so low that a $5 a month subscription covers it and makes profit.
