The duckduckgo search results are great, but most of the ads have nothing to do with the search term or are scammy. In particular, there seem to be a lot of "download free antivirus" and "get paid for surveys" (just give us a bunch of personal information) type ads. I think that if the ads were better, they would get clicked on a lot more, making more money.
*$5-$75 Paid Surveys?*
Learn How I Am Raking In $500-$3500/Month Just By Taking Paid Surveys!