Personally, I have no problem with AI for personal/private use.
If you want to share your AI stuff with other people, all the power to you. I love the AI stuff fans have made with Blackadder's works shared over in the fanart thread.
Where I draw the line (pun intended) is when people charge or make money off of AI art.
Art has value to me personally because it's something I cannot do on my own, or will not put the effort into doing myself. It's like paying a chef to cook you a meal you do not know how to make, or if you do know how to make it, wanting someone else to make it for you so you don't have to put that effort in.
The difference between me a traditional artist is vast. I'm okay at drawing and painting, always got As in school for the subjects, even in my college elective classes. But me vs a professional? No contest.
However, if the a painter or drawer and I were to use AI to produce the same thing? Our works would be at almost equal quality. Sure, the traditional artist can touch up the image better than me, and maybe have a better eye for what looks better aesthetically, but would I personally want to shell out money for the minute difference? No.
The difference between me and a 3D artist like Blackadder is even greater. I wouldn't even know where to begin trying to render a work that could rival his.
But his AI videos he's selling? I could probably do an about equal job, just like with the traditional artist. And even if his videos are better, I'm not willing to pay for the minute difference.
I haven't seen his AI stuff yet, nor do I have any real desire to. But I bet some of the stuff fans have already produced in the fan thread are better than what he's made, all for free compared to Blackadder's prices.