I also of course don't think this is FUD at all. As far as I know, this is the first quantitative study of any kind about the filter bubble. I think it is hard to dismiss a concept out of hand when it hasn't even been effectively studied yet.
Also, the filter bubble it is not an effective marketing message because it requires too much education given it is a complicated subject no one knows about.
I also think tailoring can be just fine when it is opt-in and you are in complete control of your data.
As for DuckDuckGo, we've been telling people plenty about new stuff. Most recently we've been focused on our open-source plugin platform -- DuckDuckHack, http://duckduckhack.com/ -- where you can hack the search engine. And people have been doing it and making cool stuff, e.g. https://duckduckgo.com/?q=khan+math and lots of others: https://duckduckgo.com/goodies/.