My claim is that Microsoft operating system was silently detecting competitors software and changing behavior to break compatibility. That is proven. The war on WordPerfect was equally shady.
Did Microsoft clean its act at some point and stopped doing so? They force Edge at every opportunity, so even the behavior that almost got them forcefully partitioned is back.
I don’t think we have caught them outright sabotaging e.g. Chrome aside from the default browser shenanigans, but who would bother to check unless it’s a repeatable crash? Aside from Chrome what app do they even have a need to sabotage? Steam?