That's why we have state. There are many technologies that we, as a society, decided to control in various ways. You can't just build a nuclear weapon for example. There is no particular reason why we let tech bros control many aspects of our lives, apart from legal inertia.
LLMs can be "trivially" decentralized by expanding the concept intellectual property to also cover algorithmic processing. It's just about how we setup our laws and rules.
The State are the people and the people want tech billionaires because they want the same chance at being that (tech) m/billionaire.
Temporarily embarrassed millionaires; I cannot get around that issue toward collective action, toward myself contributing to an answer. I'm stuck. I can't unsee its truth =/. The individual will choose enrichment. We all will.
Nobody had to legislate Free software into existence in order to protect us. Wise people saw the need and did something of their own accord. We are still free to do this!