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> what's to stop websites from detecting you've selected text, unselecting it, and copying the bad text in, and then reselecting it

Disabling JavaScript.

it'd be trivial to trick users to copy the wrong text with only CSS.

Wait, how?

Make a layer that isn’t visible with “opacity: 0” that sits in front of the visible text. A user copies the invisible text instead.

Or conversely, make the visible text “pointer-events: none” and it sits in front of the dangerous text.

Both of those make sense.