In the end MS did not sue anyone... but it got what it wanted: total chaos in the Linux desktop world.
True. But it wasn’t their accomplishment. Nobody dragged these DEs into an endless war against their own users and developers. DEs were just frontend frameworks of the day.
Those skilled enough to apt-get install <lighter-de-or-wm-of-choice>, tick few checkboxes and fill menus with commands - were constantly perplexed by all the drama.