Ecosia does still rely on Bing, and will for a while. But they are building their own search index and started rolling it out for more and more search queries and languages last year.

No they’re building their own open european search index currently with Qwant

Thats honestly why I use Qwant. They’re from europe (France) and even tho they still rely on Bing they are working with Ecosia to build their own independent european search index