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But I thought kwin was the window manager. And that the DE in KDE stands for Desktop Environment, so it's weird that it's actually an organisation.

Apparently they "retired the expansion" of the initialism in 2009: https://dot.kde.org/2009/11/24/repositioning-kde-brand/

Totally missed that - makes sense, thanks! I assumed Plasma was a rebranding so was surprised to see KDE making a comeback.