I recently called this (and other Microsoft behavior) out as being "fake" open source. The comment was highly controversial with quite a battle of up and down votes - so clearly not everyone agrees.
In my opinion, Microsoft wants the good vibes and PR that comes with open source, but they don't actually want to be open source. Its why many people still don't trust them in this arena.
Regarding fake open source, WSL2 comes to mind. It is entirely useless that it's open source except in one way, people can help Microsoft to replace Linux with Windows - for free.
At least they are making windows so bad that the incentive to go the other way around with Linux and wine looks better by the day. I personally made the transition last year. I have been playing with Linux since late 90s with dual boot, vms, wsl etc. But Linux never stuck as my main driver. I still don’t love it, but they managed to make me hate the windows experience so much that it feels natural to switch. I also have Mac, which I am using less and less for some other unidentified reason. Probably, that experience has degraded too but in more subtle ways.
Like Android for example?
Yes, Microsoft has an history, yet it isn't as if there is any big corporation doing full open source across all their products, the large majority only does the part that somehow brings good vibes, cuts down their own R&D costs, or is a kind of suble way to find out about possible new employees.