Since !bangs are just using the URL search scheme of the site you're trying to search, it's just redirecting you to Google when you use !g, which allows Google to set cookies and use trackers. By using !g, one is sort of defeating the purpose of using DDG, so that's why I always like to recommend using Startpage and !s as a fallback instead.
The market is ready for a new provider imo.
By creating search keywords for my 5-10 most common sites to search things on, I have eliminated the majority of the searches I would have otherwise sent to a general purpose search engine.
https://www.google.com/search?q=site%3Areddit.com+%s
Of course, you can use any search engine you want, such as DDG. You just have to figure out the URL scheme for limiting the search to a specific domain and include it in the search URL when adding it to Firefox (or any other browser that lets you manually add search engines and keywords).