NNTP, so awesome until 95% of its resources were consumed by its abuse as a file sharing platform for (naughty to nasty) images and pirated software and until power-hungry local group moderators started abusive banning/deleting practices against people who disagreed with their opinions on politics etc.

People want their own fluffy & safe social bubbles, not open, distributed networks.

You do realize that DDG is the modern incarnation of Dogpile?

Also, why are we pretending that Bing, Yandex and Baidu don't exist?

Because Yandex and Baidu give your data to some of the worst governments in the world.