> Saying "fuck you" to someone who gave you something amazing for free, because he's not giving you as much as you want for free

I don't have a problem, on principle, with paywalling new features. I don't like it, but I don't think it's bad behaviour.

Putting up a paywall around features that were previously free, however, I do take issue with. It's deceptive and it's not common practice. It tricks people into becoming invested and then holds hostage the features that they've become invested in using. Frankly, fuck that.