Why is Copilot so bad?

From what I've seen, Copilot does not annotate its suggestions with information about the status of the material it derives these suggestions from. That is, Copilot is “misleading” recipients of code snippets about their copyright status by not saying anything about their copyright status at all and instead requiring the recipients to figure out for themselves if the snippets are copyrighted (and if so, under what license, if any, they may be used). This may be justified from Github's/Microsoft's POV because many of the suggestions Copilot makes may be too trivial or too much like very obvious boilerplate to qualify for copyright protection in the first place, but there is no guarantee for that. Accidentally including, e.g., GPL material from Copilot output into their own non-GPL projects is a risk that Copilot users need to deal with somehow.

Nobody would have a problem with Copilot if Copilot said, where appropriate, “This code snippet derives from code licensed under the GPL”, because anyone receiving such a code snippet could then decide for themselves whether they wanted to accept it on those terms and act accordingly. (It would depend on the nature of the snippet in question whether this is an actual problem; e.g., three lines of schematic boilerplate from a GPL project are probably fairly innocuous to take over even for non-GPL code, but a nontrivial piece of nonobvious code might be more of an issue.) It would certainly suggest more effectively that the Copilot project is acting in good faith than simply sticking one's head in the sand.