Your mistake was in thinking that Microsoft actually cared about Skype. The acquisition was subsidized/paid off by the NSA, which had been wanting Skype to be owned by an American company for a while:
In 2012: they replaced Skype's P2P architecture to make it easier to spy on (obviously they wouldn't say that, just like Facebook never says it's building shadow profiles for advertising reasons: https://arstechnica.com/information-technology/2012/05/skype...