I started using DDG as my default search engine about 6 months ago, and for 95% of the searches I do it's totally fine. I don't know why people think that DDG needs to "stop" Google; did people think that Lycos and Infoseek and Yahoo couldn't coexist back in the 90's? I think it's good that both companies have some competition from each other.
DDG = Bing for most of the queries in US. You are basically using bing and 95% of the time and happy with it. Good I guess.
I don't particularly care who is giving me the data as long as the results tend to be OK; I don't run any MS crap at home but if their search service tends to work alright, then power to them.