> turns out plenty of people say they write for others to read

LLMs are not people. They don't write blogs so that a company can profit from their writing by training LLMs on it. They write for others to read their ideas.

LLMs aren't making their owners money by just idling on datacenters worth of GPU. They're making money by being useful for users that pay for access. The knowledge and insights from writings that go into training data all end up being read by people directly, as well as inform even more useful output and work benefiting even more people.