One difference is that Apple nor Microsoft has a natural monopoly.

There's a hassle of changing OS's, but ultimately it's a market in which the must compete.

This is all just one giant opportunity for a company that actually wants to cater to what customers want.

That is part wishful thinking and part misunderstanding the market. These are "industry standards" and you are thus completely locked in. Thus, when Adobe switched to their subscription model, what people wanted was a software that is 100% compatible and looks and functions identically, but without the bullshit. Surprise that does not exist because only Adobe can legally offer that.

All Adobe did was lock out small players who have found alternatives. Blender comes to mind. Even big studios have blender somewhere in their workflow. Its a marvel.

Displacing the long-time market leader would take 5-10 years and a lot of money and defensive litigation. Autodesk was the premium CAD software when I got my first job building computers in the 1980s. I think it's a little silly to call it an opportunity unless you have $10s of millions in capital to get the ball rolling.

Of course you could take an open-source approach like Blender, but that's a 20-30 year climb.