Because it’s literally advertising for LLM companies. Because certain news sites conclude from it that “AI did $thing” instead of “engineer did $thing, using whatever tools they found useful”. Because you can’t actually enforce it, which makes the tag completely useless.

Any of these reasons is good enough on its own.

Plasma is started in nested mode, so it can’t control any physical screens.

If you start a session with the drm backend manually, it might work that way - if you do have those DisplayLink drivers working. The USB port does not support DisplayPort.