Really want git? Hire a CM mgr/team to manage your code. Been that way before 2010 (yes, it did suck). Doesn't matter if it's done in-house or out-house.
Skype had the same situation/skepticism. And MS basically engineered it to be irrelevant.
Linkedin? It maybe ok now, but to see who in the network clicks on you and more recruiters... at a prime membership of $30/mo? With the same opptys as Indeed? And with more spam and solicitations? Aside from Linkedin being on the edge of being another FB+Tinder.... Well, I think we see where it's going by year end of 2019. Wouldn't be surprised if it gets engineered into irrelevance too.
As for these new managers like Friedman: they'll will hold the FOSS torch for a year, get frustrated by internal politics and leave likely.
MS will likely listen to the community, but it's to exploit them into MS products, mainly Azure. And of course the community will be smaller than today. No way MS would abandon MSVS/TS--much like Oracle: too much invested and a good size community.
It's not free.
Grant money means someone's paid for it (us, taxes). Volunteer is about credit, not fiat, but still costs something (gpl restrictions).
Jupyter is great, it's revolutionized online education for example. But it's not as full featured as Mathematica, and like most Foss projects, slower to fix bugs, aka you get what you pay for. Both have a place unless you have hired, 100% dedicated help on juptyer. This is much like public radio vs corporate. Together they do the market needs.
1999,MS Windows was de facto, but everyone hated it. Linux/Unix/MacOS was for the cool kids.
But all business folk loved MS, still do, from shareholders to 401k holders.
FB is no different.