To the extent we have a choice in search provider at all, it's entirely due to Microsoft's huge investment, and I feel like it's remiss not to consider those implications. If Microsoft eventually throws in the towel and shuts off Bing, then DDG will cease to exist. It's not like this plucky little underdog of a company that people are rooting for has any chance on its own. The market dynamics of running a successful search crawler and engine are important to consider here and totally brushed under the table in this article.
If DDG is simply a skin for MS Bing along with anonymous/little tracking, maybe that's what the people want?
I think the guys in DDG know this, but if they don't.. they're a bad business decision from Microsoft away from nonexistence.