And DDG tracks your clicks just like Google does.
My understanding is both Chrome and Firefox can do this natively, ie without DDG
1. I don't have to add those things in my Browser
2. When I searched DDG for something don't find good stuff I can just go to the search bar on the DDG page and add any !bang to query a search engine I like (!y for Yahoo, !g for Google, …)
3. No matter which Browser I use on which device, the only thing I have to change is the default Search engine and it's set up for anything I want to search. This is especially nice for me since I use Firefox on my Mac, Brave and Safari on my iPhone and Brave and Chromium on my Windows device
At least some of the bang keywords work with the "!" on either side. I tried "g!" and "w!" and they work OK.