>Most of the points is arguing that NSA could compel the company Duck Duck Go, Inc to install equipment and then forbidding the company from disclosing that fact.
You don't need to do anything like that. DDG doesn't crawl the web itself, it uses API providers like Bing (Microsoft/NSA) and Yandex (Russian/FSB). They're legally required to disclose that on their site.
It's possible to identify people solely through anonymised credit card transactions[0] so doing the same for search results is pretty much the same.
DDG isn't private, it just gives the illusion of privacy, same as TOR. That said though if you're a high profile target then there's much more direct means to track what you're searching.
You don't need to do anything like that. DDG doesn't crawl the web itself, it uses API providers like Bing (Microsoft/NSA) and Yandex (Russian/FSB). They're legally required to disclose that on their site.
It's possible to identify people solely through anonymised credit card transactions[0] so doing the same for search results is pretty much the same.
DDG isn't private, it just gives the illusion of privacy, same as TOR. That said though if you're a high profile target then there's much more direct means to track what you're searching.
[0]http://www.sciencemag.org/lookup/doi/10.1126/science.1256297