A company is not a person in this way. If a company wants all of their employees to read a book, they are not allowed to buy one copy and then make 5000 copies

A company is not a person in this way. If a company wants all of their employees to read a book, they are not allowed to buy one copy and then make 5000 copies "for archival purposes - fair use" then share those copies to their employees. Similarly, if they want to base a work on a copyrighted work, they can't just buy a copy for personal use (nevermind the fact that most of the data the LLMs are trained on is not even available in this format, it is only available under a license) and then use it in a commercial product in this way - not if the product demonstrably contains copies of that work.