A one time payment like 1.5B doesn’t do anything. There needs to be a royalty payment based on if the AI regurgitates existing ideas. That is probably the correct way to legislate this. If anything a human does can instantly be copied by an LLM, and then sent to all its subscribers, things need to change
The correct way to legislate this is to abolish copyright. It is strictly a negative force. Nobody makes art because of copyright, only in spite of it.
Without copyright, anyone can copy the art and call it their own. What is then the incentive for the creator to share the art, if there is neither monetory gain and nor fame. And worse than them being recognized, they might even get accused of copying their own art if someone else became famous due to a copy.
Society would miss out a lot.