I would expect that it's more financially lucrative to have a happy userbase, which translates to a good reputation and thus larger user-base, rather rip-off a few who will eventually give bad reviews and create a bad reputation. To me the current pricing model sounds more like a bad decision rather than anything else. But in any case, if I didn't like it I would just not use it, rather than throwing accusations around on malicious intentions without having any evidence.
PS: I am not even remotely affiliated with the creators of that app