Under the principle-agent relationship (the concept, not the legal definition), I do think it's fair to blame Microsoft if they don't remedy this soon.
Out of curiosity, who _would_ the right person to contact at Microsoft be? In my experience public channels exist to isolate the rest of an organization from having to deal with the outside (including complaints about bad behavior).
>>finnth+(OP)
opensource@microsoft.com or make an issue in GH or tweet any one of a dozen people like Miguel or me or Martin who care deeply about this stuff. It’ll all get routed eventually to the Office of Open Source.