I hope you are asking that rhetorically.

But if the question is serious, its because very many people grew up with google and got really good at using it. Got dependent on the certain idiosyncrasies of how Google presents its results. Got entangled in multiple other google services that make results more relevant.

I have my entire career because I was (and am) better than a lot of people at googling things. I hate what Google has become and I do have DDG as my primary search tool on my phone now. But it's really difficult to completely jettison google search and I do still use it fairly regularly. Even though they seem insistent on making their results as trash as possible.

If anything its at least pushed me to start thinking of search engines as tools, and that regularly using more than one might be a good thing.