That's like suing someone who had an NYT subscription and read the paper daily for occasionally quoting a choice phrase verbatim. I've been quite critical of AIs impact on the livelihood of artists (whose economic position is precarious to start with, and who are now faced with replacement by machine generated art) but at the same time I reject the copyright complaint completely. Transformers are very obviously doing something else, similar to how a human learns and recreates; the key difference is that they can do it at scale unreachable by individuals.