>I'm sure that fifteen years from now, DuckDuckGo will be ad-infested crap
In terms of direct ads, perhaps. But for SEO spam, in many cases, DDG already seems to be there. For example, things as simple as "python datetime", "python json", or "python datetime.now", where it would seem obvious that the top result would be the documentation for the module/function, have spam sites above the actual Python documentation. Meanwhile, search for "matplotlib", and your screen will fill up with ads.
In terms of direct ads, perhaps. But for SEO spam, in many cases, DDG already seems to be there. For example, things as simple as "python datetime", "python json", or "python datetime.now", where it would seem obvious that the top result would be the documentation for the module/function, have spam sites above the actual Python documentation. Meanwhile, search for "matplotlib", and your screen will fill up with ads.