These are massive platforms. They have incredible reach and potential for developers. If you choose to use them (specifically in a manner that makes them vital to your business), you have put yourself in a potentially bad position in exchange for a potentially massive gain.
If you manage to leverage that position... you are that much more dependent. And with the number of acquisitions and implosions of this nature that have happened over the last few years, there is no excuse not to see it coming early on.
I'm not suggesting Big Social (I just made that up!) is good or right, just that it's not horrid or evil (from an API access standpoint). It's operating exactly as you should expect an entity run by people to behave: In their own best interests. Is this ideal? No, not for the rest of us. But that's how it is, always has been, and always will be.
That anyone still considers this newsworthy is the only surprising part of it to me.