Umm.. but there is an API and that's how these sites work. They tap into the API and Journal.
What they want is more ease of access and functionality as i understand it. And presumably more openness and documentation.
And I can support what they want.... just not what they are doing.
As someone else said, if FD give in here, then the next time they want something they can do it again, and other groups with large followings can do the same. Its the same situation as dealing with terrorists or hostage situations (and no, i'm not comparing the 3rd party devs with terrorists or hostage takers - just saying its the same principle - before someone jumps in and tries to say i am saying that).
Once you give in, you open yourself to every tom, richard, and harry who wants to push their own agenda.
If anything, they might now have harmed their own position, as if FD cave in now, they open themselves to more of this in the future. They might be best off making a firm statement of "We will be making no changes at this time"
And then what? Those sites will go offline? Ok. A pain, and the community will be upset for a while. Or they will say, ok, we have what we have and things work, so let's just get on with things. Or maybe new devs will come along and fill in the gaps.
All depends on FD now I guess. I know what i would do in such a situation though, and it would not be to capitulate. If it means some loss, i'd accept that. I would never allow myself to be held to ransom.