It was a cynical way of critizing that they collect so-called anonymized usage data, for example for people who really need something anonymous they could start offering a gateway to a search that doesn't collect anything at all.
I have split up my browsing and search among multiple browsers, depending on the use case, and I use Bing, Google, DuckDuckGo and Startpage, mostly for having different perspectives as I found out that only using google limited the stuff I found. (Google serves Startpages different results than what they show themselves)
https://help.duckduckgo.com/privacy/atb/?redir=1