In my career, first it was IBM, the unstoppable juggernaut that was going to take over the world. Then it was Microsoft, and everyone forgot about IBM. Then it was Apple, and everyone forgot about Microsoft. Before IBM, it was RCA. Everyone has forgotten about RCA. It's like in retail. First it's Sears, the unstoppable juggernaut that will take over the world. Then it's Walmart, and Sears is bankrupt. Now it's Amazon…
I'm not sure I find your examples convincing. MS still firmly monopolizes desktop OS (over 85% market share there). Sure, that market has lost weight due to the rise of mobile, but last I checked we're all still doing our day jobs on desktop computers, and for most office workers (who aren't developers), that's synonymous with working on a Windows machine. For 20-30 years people have had effectively no freedom to cho…
Microsoft would have to be doing anticompetitive behavior to be monopolizing the desktop market. Things such as forcing OEMs to not allow linux support, or banning iTunes installation on Windows. Simply being popular isn't the same as a monopoly.
Apple has, on the other hand, been monopolizing their iOS devices with the app store. It is the only way to install apps on iOS and Apple has played fast and loose with competitors (like Spotify) in the past: https://www.macrumors.com/2019/06/03/eu-awaiting-apple-respo...