I don’t know how much of an anecdote it is, but all the non-tech people with whom I talk about IA only know chatGPT. Competition is either non existent or the same thing. Among those, no one wants to pay the service, they just stop using it when limits are reached. I can’t say which users can turn the market around but chatGPT is indeed burned in the mind of many and because they don’t care about tech and are not interested in tech they won’t search for any other service it seems. Even after many discussions they don’t remember the names of other IA I told them
The only two models I ever hear non technical people mention are ChatGPT and occasionally Gemini
I would bet 100% of those people have either Apple or Android phone in their pocket. Android users already have easy access to Gemini, and Apple's Siri is going LLM soon enough as well.
Google and Apple just need to push their AI assistants hard enough, and most of the moat OpenAI has will be gone.