1. The credits for my code are protected (with the GPL you have to tell where your code originates from). That's the ego part. It's important to me because I'm not paid for my software. So credits are an important reward.
2. I want people to think twice about reusing my code. I use the GPL license because I think sharing software is the ultimate goal. So I force people to share my software by using the GPL. That may sound "extreme" (that's the whole open source vs free software debate) but, not being a full time politician, I can't change laws to push society in the direction I want. At my level, that "push" is the GPL choice. Maybe it's not noble enough, maybe it's cowardice, but it's my way (compare that with those who simply don't care).
AI severely weakens both of these. And for people like me, this forces us to reconsider our position. For my part, I accept the legal point of view that A.I. doesn't steal code, and just reproduces the ideas in the code. So, as far as ideas can flow in society, I'm OK with that (that's the principle behind copyright laws).
If AI has its way, one day one will not need to write software, we'll just ask the AI. In that case, software will be dead and free software will die with it too. By then I'll do my "local politics" another way and follow the next RMS.