The thing about other search engines is most of them have no spam filtering. Google search is good at protecting users from spam and phishing sites as it detects malicious URLs and removes them to prevent users from clicking on them. A user on /r/privacyguides posted that DuckDuckGo doesn’t have the same level of filtering as when he searched for Github, it showed a fake, malicious link.
Take Wiby for example. Wiby is one of the worst search engines to use because it is powered by user-submitted sites, meaning anyone can submit a fake URL and there is nothing stopping anyone from clicking on a malicious URL. This should really be considered with search engines.
I think Privacy Guides should warn people about the dangers of using other search engines that don’t use Google’s search index. I’m not saying you shouldn’t use DuckDuckGo and I understand if you’re concerned about censorship, but for security-sensitive searches, you should only use Google or a privacy search engine that uses Google’s index, such as Brave search or Startpage.