I think there's space for more than two private search engines. The difference would be that it would be tightly integrated into the system and probably the def

I think there's space for more than two private search engines. The difference would be that it would be tightly integrated into the system and probably the default search engine in Safari which comes with an important and huge mobile market share that DDG / Startpage don't have. Most people that are not frequenting HN probably don't even know what DDG or Startpage are because they just use the defaults.