landley, 
Every time Microsoft buys an online service, they destroy it. Microsoft github is progressing along approximately the same timeline as the others:
https://mastodon.social/@bendelarre/111585575314778379
Microsoft bought Hotmail when it was THE webmail service, now there's a bunch:
https://web.archive.org/web/19991013145536/http://pbs.org/cringely/pulpit/pulpit19990826.html
Microsoft bought Skype when it was THE voip+video service, now there's a bunch:
https://www.cringely.com/2011/05/12/why-microsoft-bought-skype/
Microsoft bought github when it was THE git hosting platform...
