Monopoly over what?

LLMs that actually work.

They are on GPT-4 and no one else is close to GPT-3.5.

If no one else has yet to create the same quality of product, is that really a monopoly?

Does a given chef have a monopoly on their signature dish?

It feels like people are tossing around "monopoly" whenever it feels like there's a company that has produced a quality product and people want to hobble it because no one else has committed the resources to producing something comparable.

I don't want to hobble it at all. To the contrary, I hope the competition pulls their heads out of their asses.