Concentration of power is (or at least I thought it was) obviously bad. This is why there's laws protecting against that but either they're not enforced or they weren't updated to the internet age.
It is a concern but being popular is not the same as having high power: GitHub has lock-in to the extent that it's a great service but it's not exactly like they're changing Git to prevent you from using your own self-hosted service, Gitlab, BitBucket, etc. Similarly, VSCode is open-source with tons of competitors: where's the angle where they have much ability to dictate anything to users?
You left out the part where you explained why any of those acquisitions are a problem: LinkedIn is no worse than it was before, GitHub and npm are both popular services people choose to use without coercion, and whether or not you like it a lot of developers are switching to VSCode because it's a better tool which makes them more productive.
I don't what you believe to be true about their Azure integration but I know many people who use GitHub, npm, VSC, etc. and none of them use Azure so clearly there's some key step missing in that process.