* DDG in 2018 has served similar amount of search queries as Google in 2000.
* DDG growth rate is accelerating
* Google search growth rate is negative
* Google's share of global search is shrinking
DDG stats: https://duckduckgo.com/traffic
Google stats: http://www.internetlivestats.com/google-search-statistics/
Google search growth rate is always positive in that page. It just decelerated. Growth rate being negative means you're actively losing more users than you gain.
I know it was their first product, but I would imagine they get much of their revenue from other avenues, such as Android's built-in totally-not-antitrust web search app, and YouTube and Gmail and web ads...