Privacy doesn't come from good engineers and great secure tools. Google and Facebook probably have the best engineers in the world. Privacy comes from the incentive motive behind a tool. if Google or Facebook are incentivized to collect people's data, they will, with all of their skilled engineers. Therefore, when you have a search engine that rely on ads to make a profit, that smells like problems (like DDG for example). Actually, whenever you see a business, you pretty much always see problems.