Once all competing language models and providers have hoovered up all the existing knowledge and can do similar things with it then margins for that part of the story will shrink rapidly.
It will all be about access to new information, access to customers (such as advertisers) and access to users attracted to other aspects of the platform as well.
I think producers of new content and their distribution platforms will have a lot of leverage. Youtube, Facebook, TikTok, Spotify, Apple, Amazon, Netflix, traditional publishers and perhaps even smaller ones such as Substack and Medium, are all gatekeepers of new original content.
I think Google is best positioned to make the economics work. Unfortunately, they don't appear to have the best management team right now. They keep losing focus. Perhaps the danger of their core business getting disrupted will focus their minds.