It's about the persistent anti-customer things they do. Their in-product adds, their dark UI patterns, their telemetry which is very hard to get rid of. And now they want even more control over your desktop by going DaaS.

About the Microsoft <3 open source: Undoubtedly I'm biased, but I believe the whole "<3 Open Source"-thing has more to do to establish a foothold than anything else. Like Google, Apple, Microsoft is large enough to keep absolute control over their open source projects. The risk of a fork of their OS projects gaining traction is zero. Meanwhile, their real moneymakers are kept closed.

In the end, for them, it's not about you, but over the control they have over you, so you won't or even can't jump ship.

At work we're MS-only (W10, O365, VS, SQL Server, etc), whereas at home I jumped to Kubuntu when Microsoft released Windows 8. So yeah, I can compare a bit. What's weird, I find the quality of Microsoft-products generally is not better or worse than FOSS alternatives. Then why pay for the privilege to be spied upon, and lose the control over your own systems?