Summary: The above is important because of the timing. After 5+ years of pension fraud at Sirius 'Open Source' the company enrolled staff without paperwork/signatures and barely with any consent (in late 2016); to make matters worse, a few years ago it upped staff contribution levels without increasing its own, in effect forcing staff to send even more money (one's own money, not the company's) into this dubious pot with uncertain future.
One common concern when things go "live" is that any random bot out there can execute queries, pumping up RAM and CPU usage, as happened when we used MediaWiki and WordPress
In short, it's not too clear what Microsoft has just done except dumping GitHub - i.e. mostly a Web site that loses a ton of money (it always lost money) - into some mysterious new bucket