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.