People bought laptops and the laptops weren't what they were expecting. There's a lot they could have done in the abstract. There's a lot less they were capable of doing in reality.
Would you call Ubuntu's decision to suddenly switch all the window controls (Minimize, Maximize, Close) from left to right in one version an abuse of their "monopoly" in the Linux desktop world?
And Linux users have a full spectrum of distributions to choose from. If Ubuntu acts like an ass-hat, I can easily switch to Mint when the LTS version is no longer supported. I have a choice of desktops environments that all run the same services and applications. I'm not locked in, nor is my data. Squeeeeeee!