Looking back to an earlier post on the Generative Adversarial Network( GAN) generated images:
that Wikipedia’s definition of public domain applied to an AI generated image in that article is declared:
This file is in the public domain because, as the work of a computer algorithm or artificial intelligence , it has no human author in whom copyright is vested.
but also noting in the footnote, that UK copyright law (in 2021) provided the 50 year copyright protection to AI generated images-- see Artificial intelligence call for views: copyright and related rights