LLMs absolutely have a market. It's a market that's probably in the low tens of billions of dollars worldwide. Non-critical translation, content writing, image generation, mockup. Etc etc. there are absolutely uses for LLMs and other generative AI.
The problem is that hundreds upon hundreds of billions have been invested, with hundreds more on the way. The current investment will never be recovered.
And these aren't durable investments, the equipment has a very limited shelve life, the chips aren't going to last nearly long enough to recover their cost, and the data centers are already obselete for the next generation.
Edit: getting downvotes for recognising that there is in fact a market for generative AI, by people who didn't catch that "the low tens of billions" is about 1% of what AI boosters are proclaiming.