I use Gemini at work, and ChatGPT for everything else 'personal'. Also from my non-tech friends, I usually hear them talk about ChatGPT and not Gemini or other models. I think, even if Gemini outperforms ChatGPT, there's definitely a strong 'first mover advantage' at play. I suspect that being outperformed by Gemini etc won't diminish their market share significantly.