Memes

That is not what you have said.

I beg to differ. Care to show me an example?

A camera or a paint brush can be used to plagiarise as well so drop that

Unlike cameras or paint brushes, the overwhelming majority of generative AI is trying to cut out the artist in an artistic process (the rest is used for deepfake porn). Since the training data for the AI was taken without consent and the original authors aren't credited, IMHO, it counts as plagiarism.