IP laws have more or less handled humans stealing ideas from humans for commercial gain. not perfectly by any means...

"Until author's death + 70 years"... not perfectly, is WAY of an understatement.

an AI copying, ingesting and tokenizing other people's intellectual property is nothing like a human watching a video or hearing a song and creating something based upon or derived from it. a database backed algorithm does nothing even remotely like a human mind. it's using software to process and regurgitate the works of others, and that is pretty plainly IP theft.

Wrong. There is no database of the training data in the model that "regurgitates" abstracted concepts from it.