While I'm opposed to the use of A.I. for many reasons (ethical, environmental, anti-capitalist...) we should judge these things in context.
I don't care about a streamer being fake. Many people have jerked off to porn that's CGI, or animated like hentai or western cartoon porn. That's fake, too. And that's okay. That's totally ethical.
The image being fake isn't the problem. If she's got a cute face, a feminine voice, and nice tits, then it's just acting.
What's awful is the unethical use of stolen data to train A.I.
What's awful is the use of data centers that consume more power than god, harming the environment and jacking up utility bills for everyone.
What's awful is communities with their drinking water levels impacted by the servers running A.I.
Frankly, I don't care if the image I'm jerking off to is hyper-realistic CGI run by a dude. A lot of the cartoon porn I've watched was probably drawn by a dude, too. Same deal, just updated tech.