That person might actually contribute some of their own knowledge and experience. Also you probably put the information out there because you want to spread it, but once it's hidden behind an LLM chat prompt the community dies.

You're correct that there's not really anything stopping a person from ripping you of, tweaking your work just enough that it's not a copy right violation. Unless that person themselves have a really good grasp of the topic and can contribute it will become clear that they are getting the content else where and the readers will end up there in the end. Many, not all obviously, will also provide attribution, something LLMs rarely do.

Then you have the issue that the person publishing something on their own little server now has to deal with commercial companies just hammering their sites into the ground and they have to deal with that problem, just so someone can do an automated version of content theft?

A lot of things people could potentially do are minor issues, until it's automated and commercialized.