Monopolies are natural in highly technical industries. But monopolies don't last forever. New technologies wipe out monopolies all the time. ChatGPT is disrupting Google search monopoly. Solar/EV is disrupting oil. Tools like V0 is disrupting Figma. ChatGPT itself is disrupting iOS and Android. The list goes on and on and on.
You are mixing industry and company. LLMs are overtaking Google search (I.e., internet search which is a monopoly), but it doesn't have to be chatGPT (I.e. openAI).
In any case, it's irrelevant they are not eternal (especially if we go from monopoly to monopoly), the point stands: if you have a monopoly you don't have freedom and free market doesn't work at all.
“Solar/EV is disrupting oil” — where exactly has solar/EVs disrupted oil without the benefit of (wise, IMO) government intervention and subsidies?