If I asked you a question and you answered me, YOU would be more popular than Bing. Microsoft has spent billions on it, it is the default engine in IE and Edge shipped on millions of Windows PCs, and Bing has slightly more than 1% of the search business.
Ecosia uses Bing as the back end, which is why it’s so disappointing. Results are terrible. Fortunately, there is a button to repeat your search in Google. This way, you can get Ecosia some tree dollars but then get proper results.