Mostly because Microsoft doesn't really gatekeep Windows and is actually compliant with the DMA; they were motioning to the same tricks as the other gatekeepers (main one is forced bundling), but the DMA caused them to retract on all of those changes.

Right now, you can properly remove all Windows apps from W11, which was really the big one that they started doing with Windows 10 alongside the Microsoft account push in OOBE (dunno if that one is still required). They also supposedly made actually disabling the Windows telemetry much more feasible than it used to be.