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Because it's the most popular & flexible cross platform user space compositor:

- unlike QT it's free for commercial use.

- I don't know any other user land GUI toolkit/compositor that isn't a game engine(unity/unreal/etc).

Why does it need to be cross platform? If code was free there would be a native app for each platform using its respective toolkit, not QT.

Well they wanted it to be cross plat because more users.

clearly the code isn’t free and writing for raw win32 is painful.

Qt is LGPL, so free for commercial use in most situations.

There are rules when using the lgpl version of qt, the kde foundation has an exception I think.