I'm very similar to the OP here, always hear about ChatGPT rarely anything else. Most people are definitely not paying, but of the few that are paying, outside of software developers, they are all paying for ChatGPT exclusively. I don't know of anyone paying for the basic chat versions of other AIs. A few developers paying for Claude and Gemini, but I know hundreds of people that talk of ChatGPT and no other AI, again most not paying though.

Outside of work I don't know anyone who pays for AI.

But I have noticed that everyone seems to be using ChatGPT as the generic term for AI. They will google something and then refer to the Gemini summary as "ChatGPT says...". I tried to find out what model/version one of my friends was using when he was talking about ChatGPT and it was "the free one that comes with Android"... So Gemini.