I think the author nailed it. This is Microsoft's chance to reach out to developers and prove that they've had a change of heart regarding open source. We've seen this over the years with previous code hosting platforms. If the platforms betrays it's users, developers are not scared to mass migrate to something else. The onus is now on Microsoft to keep developers happy or risk losing their $7.5B investment.
That might be because I'm deeper into web development though, and both TypeScript, and VS Code are great contributions.
Maybe I'd feel different if I worked in ML, and used Tensorflow daily.