The logic is when you made DDG your default search for the address bar. Then it becomes the zero-stop jump off point for all the other search engines they have

The logic is when you made DDG your default search for the address bar. Then it becomes the zero-stop jump off point for all the other search engines they have !bang syntax for (which are thousands, I think). I used to configure those as search keywords in Firefox (and before, Opera), which do roughly the same without the exclamation point. But on a new browser, even just configuring your favourite top 5 searches is a lot of hassle compared to just setting DDG as the default search and using their bangs.