I have been a happy Firefox user for 15 years... maybe more. I have seen people use and complain Internet Explorer in my younger days, from version 6 to 7, etc. Even though I mention Firefox to them, they stay with IE. What amazes me is how quick they transitioned to Google Chrome when it released. This was around 2009. It amazes me how quick people jump to something especially when it has a big company behind advert…
We had Firefox 0.3 which was very, very slow browser but still much better than Internet Explorer. There was a lot of mental gymnastics involved to get pages display at least similar for both browsers.
When Chrome 1 was released, it was absolutely awesome. Minimal interface. Focused on browsing. Incredibly fast, it just executed JS stupidly quick and we could create web app interfaces that didn't lag
You can still download Chrome 1 and see what it's about. It was basically what users wanted: supports more CSS features than other browsers, starts fast, executes JS fast, provides adequate developer console, renders pages correctly.
It took all of us by storm because it was genuinely good software. That era was the era of good software, not spam advertising.
Today, in 2023. this is not true any more and you are entirely correct when asking why people would use Chrome. Answer is: laziness, lack of info, apathy, lack of knowledge.