One possible response to this information is to try to educate all users of the web not to copy paste from a web site into a terminal.<p>Another possible response -- the one I prefer -- is to change the web browsers so that the copy operation only ever copies selected text visible to the user.  That is how the copy operation works in my text editor and how it used to work in web browsers in the 1990s.<p>Copying and pasting are <i>useful</i>. The fact that some are  trying to persuade all web users to stop doing it -- or to stop doing one common kind of it -- is a sign that there is something wrong with current web browsers.<p>Yes, I know that Unicode contains glyphs that look so much like common ASCII glyphs that a user can be fooled into, e.g., curling from a site controlled by an attacker when he thinks he is curling from github.com or some other trusted site. Maybe that means that the browser warns the user whenever the copied extent of text contains non-ascii characters; maybe the browser simply refuses to copy the non-ascii characters. Regardless of how we deal with malicious use of obscure Unicode characters, I think my previous paragraph holds up.<p>(Users of languages other than English should replace &quot;non-ascii&quot; above with &quot;characters not commonly used by writers of the languages that the user usually uses&quot;.)