The LLMs don't create new content, they can only rehash existing content (in term news), which they then don't pay for... It's not really the definition of rent seeking though, they do provide some value and mostly without manipulation, not deliberate anyway. LLM also aren't harmful as such, they can be, if we use them wrong, but that's not really the fault of the technology.
I do find is a bit dishonest when they charge for their services, but don't wish to pay the people who's work the models are based on. Why should I pay to use ChatGPT, if they won't pay to use my blog posts?