Googler here, so here's a sample size of one.
1) I personally use Google, because it works for me. I will admit freely that part of this may be that I've gotten used to framing queries such that it works with the search engine that I'm used to using, and that's probably true for many people commenting on HN.
2) Every so often, these posts will inspire me to do my own non-scientific experiments such as using the same query, say, "Dua Lipa Levitating" or "Go modules vs packages" on say, DDG, Bing, and Google. When I did this experiment most reently, I generally find that Bing and Google are both more personally useful for me and DDG is less useful (but as the old latin saying goes, "De gustibus non est disputandum"). I will note that DDG had the more obstrusive advertising at the top of the results (Stubhub and Urban outfitters), and Bing and Google did not have any adds that I could find for that first query.
Given my personal evaluations, it tends to cause me to discount what many of the DDG enthusiasts have to say about DDG being is way better, simply because it doesn't accord with my own quickie experiments. But hey --- maybe it's because they enter in search queries differently than I do.
3) Given the hyperbolic and/or highly emotive nature of some of the comments about "holding users hostage" and complete lack of nuance over "violating users' privacy", again, it causes me to have a hard time taking everything else that rhwy have to say seriously.
4) I sometimes suspect people are remembering the past with rose colored glasses. I remember the search quality of Alta Vista (and with all due respect to the people who worked on Alita Vista and having had friends who worked there), the results were pretty crappy, and Google's results were heads and shoulders above somoe of the other competitors that were available back in the day.
5) All of this is my personal opinion; and users should feel free to use whatever search engine they want, and competition is a good thing.