Not sure why you put "open source" in quotes, because it really is open source. You can freely fork it, modify it, rename it, whatever. I'm not sure what you think Microsoft's angle is for getting people to move away from IntelliJ, but I seriously doubt it's even a consideration. JetBrains makes a ton of money from Microsoft developers (most of our team uses ReSharper and Rider), and I don't think I'd consider VS Code quite in the same league as a dedicated IDE.

I'm curious; do you feel the same way about RedHat? Canonical? Java? What's the criteria for "this company is too big for me to trust their open-source products?"