Windows: Most use Chrome (Google default), the rest use Edge (Bing default).
MacOS: Safari (Google default) and Chrome (Google default)
Android: Chrome (Google default)
iOS: Safari (Google default)
So it looks like the only vulnerability here would be iOS and then possibly PC/MacOS if enough users switch their browser.
And with Edge being "basically chrome", and supporting Chrome plugins, the switching cost from Chrome -> Edge is quite small.
But for mobile, Android + iOS dominate...so that all goes to Google.
I think this could mean that Bing + ChatGPT has a really opportunity to beat Google in Search...it's gonna be hard, but I've never even considered them more than a distant 2nd option until now.