Sorry I don't know what the whole process is exactly in this but when I say taken to task I don't mean be punished I mean be investigated with regards to these claims.
No. You should not be investigated simply because your competition demands it. Otherwise you will have to spend millions defending yourself against everyone that wants to destroy you simply because your business model works. You bring evidence of wrongdoing FIRST, then open up the investigation.
After all, I can make a court case against you for breach of contract every week, and it warrants a serious investigation each time, right? Whether I have proof or not. Or even know you. That wouldn't prejudice you in the least.
MS should come out and say WHICH API's they are not allowed to use. And whether and to what extent Google intentionally blocks them (as they claim), or whether it is simply because the API is under a license they don't like.
Google has been investigated for almost 2 years now. So far not much damning has been turned up, as far as I can see.