DDG is essentially passthrough to Google/Bing/Blekko, though, so you're still somewhat exposed to the risk of those companies being crazy. Although I guess 3 is enough that DDG should be able to survive even if 1-2 go crazy or die.
It's perhaps somewhat nationalist, but Russian companies are slightly above Chinese companies on my list of "would I want my traffic going through their infrastructure", from a privacy/information security standpoint. I don't think this is irrational. (The US is far from ideal either, but has stronger laws, although is more likely to be "interested". The ideal would be a Canadian or European search provider run in some kind of hostproof model.)
