I was on the same page as you for the longest time. I cringed at the whole "No AI" movement and artists' protest. I used the very same idea: Generations of artists honed their skills by observing the masters, copying their techniques and only then developing their own unique style. Why should AI be any different? Surely AI will not just copy works wholesale and instead learn color, composition, texture and other aspects of various works to find it's own identity.

It was only when my very own prompts started producing results I started recognizing as "homages" at best and "rip-offs" at worst that gave me a stop.

I suspect that earlier generations of text to image models had better moderation of training data. As the arms race heated up and pace of development picked up, companies running these services started rapidly incorporating whatever training data they could get their hands on, ethics, copyright or artists' rights be damned.

I remember when MidJourney introduced Niji (their anime model) and I could often identify the mangas and characters used to train it. The imagery Niji produced kept certain distinct and unique elements of character designs from that training data - as a result a lot of characters exhibited "Chainsaw Man" pointy teeth and sticking out tongue - without as much as a mention of the source material or even the themes.