Google got a massive leg up on the rest be having a better service. When Bing first came out, I was not impressed with what I got, and never really bothered going back to it.
Search quality isn't what it used to be, but the inertia is still paying dividends. That same inertia also applied to Google ads.
I'm not nearly so convinced OpenAI has the same leg up with ChatGPT. ChatGPT hasn't become a verb quite like google or Kleenex, and it isn't an indispensable part of a product.