Microsoft have already started doing this to developers (forced data-mining, a.k.a. telemetry) in .NET Core and VS Code - and to everyone in Windows 10 - so I don't see why they wouldn't do the same with Github.
...or else what? Are the developers going to mass-migrate to SourceForge?[1] Github has a lot of leeway/social capital - they are hardcoded into the infrastructure both literally and figuratively.
edit:
1. I literally forgot about Gitlab as a Github substitute when I wrote the comment, interpret that as you may.
> ...or else what? Are the developers going to mass-migrate
Yes, that is the obvious risk. Gitlab is the #2 in the space, right now they don't have much market share but if an avaricious corporation violated the spirit of Github? It might be the chance they need.
I remembered Gitlab after I posted but before I saw your comment and made an edit. Github has network effects and inertia on its side - switching to any other service has a cost, and Microsoft has to piss off developers enough to justify the switch - moderate annoyances will be tolerated.
Microsoft's knows they ought not piss off 28 million developers.