No? I don't have a list handy, and I’m not the QA department for DDG. The point is - and yes, this is somewhat subjective - I found the quality of the results inferior to Google, and grudgingly switched back after a few weeks of disappointment.
The only time I ever find myself using the !g escape hatch is when I'm searching something brand new (e.g. a breaking news story). Duckduckgo has a recency filter but it seems to take them a few days to ingest the content.
So, my private life stays my private life with duckduckgo. And at work — I don't really care what google does to my "js shortest path algorithm"-kind-of results history.