Consider this: for 90% of the population, that is also true of any FOSS solution. I'm tired of the "you don't have access to the source code" argument. I don't inspect the microcode that runs on my CPU - why should I trust Intel and not Apple? And for a greater portion of the population, that source code may as well be mud.
This article is about alternatives to Google on the basis of privacy. Isn't a company that doesn't base its core business model on mining your data an improvement for a vast majority of users?