It enables the large scale theft of code. It completely ignores licenses. There are plenty of open source licenses that allow code use with proper attribution yet Copilot doesn't (and probably can't) figure a way to comply with all of them.
Copilot, as the article suggests, is a marketing stunt. To me it's more than that. It's Microsoft pushing the boundaries of law using it's money muscle again. I have been screaming from the rooftops that VSCode was just M$ spyware and I get legitimately made fun of for it. Now we have Copilot as well and they aren't even hiding it.
To address your point more directly if you do any work for monetary gain Copilot is a defacto liability. You can't just take 20 lines of completely stolen code, modify a few things, and call it your own. That's why legal reverse engineering has an entire black-box method of development. QA, researchers, and developers aren't even allowed to talk to each other directly.
I hope Copilot does get shutdown. Along with everything like it. It is one thing to have an AI trained on your workplace's code, or specific code following specific licenses, but the blatant theft of not only licensed open source code, but also private code, is a terrible precedent to have.