Agreed. Unfortunately, this is a personal side project. If it were my business, I would certainly approach it differently. The only benefit they get is that lots of people continue using Facebook who otherwise may have given up on it. Oh, and they sometimes seem to add features that I come up with first. But in general, yes - I am someone they would like to just make go away.

Which is fine - they have a right to do that. But everyone should be aware of this, because at some point when Facebook decides they don't like your politics, or hobby, or sexual choices, they'll arbitrarily shut you down, too. So, don't give them any more than you can afford to lose. But I see many companies investing a ton of time and money into their Facebook strategy. My point is to beware, because it may not be a good choice.

The main aspect of your product they didn't like us that you were inserting yourself between Facebook and their users. Any platform provider would try to stop that because that relationship is the foundation for every platform's value.

The only possible chance you have around this is growing so fast and becoming so essential that the platform provider can't punish you without punishing themselves. See, e.g., Facebook and Zynga.