What really made me worry about the future of the Windows ecosystem is the increasing amount of telemetry and Microsoft's endless attempts at trying to monetise every part of the system at the expense of my user experience, even if I paid for a license.
Making the base OS usable by disabling telemetry (and Cortana) hidden away in the settings has become a hassle. The UX dark patterns trying to make me switch from Firefox to Edge has become tiring for me. Them experimenting with ads in the file system, even if it was an experimental feature that was "never meant" for public release, made me wonder how far they were willing to push it in future Windows iterations, so I made the switch.
Edit: Worth mentioning that I switched to Fedora XFCE and I stuck with it because it doesn't get in the way of my workflow. I also noticed that it doesn't use as much background resources as W10 which is great.