Software and platform lockdown are a lot weaker than they were in the WinTel heyday. It’s a lot easier to go from macOS to Windows to Linux these days. There are many exceptions of course, but I’d wager that market is not as big as you think.
Most of the world uses web apps. Huge and performance sensitive applications like Adobe, Maya, etc mostly already have their own UI rendering engine anyway.
It’s a lot different from the Win32/x86 duopoly situation.