Starting with "any existing Microsoft account is now a valid Github login". Then maybe "you can more easily use VS (or VS Code) with Github and deploy to Azure, if you use a Microsoft account with Github" and "you can merge your Github account into your Microsoft account". Then "all new accounts on Github are Microsoft accounts, you can no longer make a separate one".
Whether they go all the way to "there's no such thing as a separate Github account anymore", not soon, but probably one day - they've been trying to centralize accounts between all their services for years and years, haven't they?
After several retries to talk to them and maybe get somebody more technical on the line, I just gave up and being disappointed I simply gave up on Skype altogether – thankfully it has fallen out of favor at work too.
Skype has been a monumental fuck up and just thinking about it on a thread about GitHub being acquired makes me sad.
Did your bet stipulate a time frame? I think the odds of this go up considerably after a honeymoon period of 2-4 years.
Their absolute best bet is to sit on GitHub, feed it money, offer the paid features as an additional perk for MSDN subscribers through an account linking method, and call it a day. The developer goodwill they can buy being a good steward of GitHub far surpasses any other value they could extract from it.