For example, I know artists who are vehemently against DALL-E, Stable Diffusion, etc. and regard it as stealing, but they view Copilot and GPT-3 as merely useful tools. I also know software devs who are extremely excited about AI art and GPT-3 but are outraged by Copilot.
For myself, I am skeptical of intellectual property in the first place. I say go for it.
When Microsoft steals all code on their platform and sells it, they get lauded. When "Open" AI steals thousands of copyrighted images and sells them, they get lauded.
I am skeptical of imaginary property myself, but fuck this one set of rules for the poor, another set of rules for the masses.
Do you have any evidence for those claims, or anything resembling those examples?
Music copyright has long expired for classical music, and big shots are definitely not exempt from where it applies. Just look at how much heat Ed Sheeran, one of the biggest contemporary pop stars, got for "stealing" a phrase that was literally just chanting "Oh-I" a few times (just to be clear, I am familiar with the case and find it infuriating that this petty rent-seeking attempt went to trial at all, even if Sheeran ended up being completely cleared, but to great personal distress as he said afterwards).
And who ever got sued for using dev tools? Is there even a way to find that out?
Among many others. Classical music may have fallen into public domain, but modern performances of it is copyrightable, and some of the big companies use copyright matching systems, including YouTube's, that often flags new performances as copies of recordings.