I see this sentiment a lot in FOSS spaces but I don't really understand why. The role of judicial process _isn't_ to provide a guiding moral philosophy around social organization. Depending on the government in question that's either a role of government functions or isn't something that should be guided at all. The role of law often (and yes, not in all governments, but at least in the US) is to offer a contract between the state and the individual.
I understand the potential for abuse here in using Copilot to regurgitate licensed works without adhering to the terms of the work's license, but I'm not fluent enough in law to know if this is illegal or not. Calling out and specifically applying strict limits this practice is certainly something I'm sympathetic to, and I'm very curious to see what the courts come up with. But swayed by a moral argument I am not.