Earlier quoted context omitted.
Because ad revenue can be used for the non-profit? Ecosia's whole thing is that when you use it, you indirectly help plant trees - "the search engine that plants trees".
Do they disclose what percentage of their revenue is donated? If it's just a token amount, then I'd rather not support a marketing gimmick and would prefer to just donate directly to an organization focused on trees. If it's a significant amount, then it seems unlikely that they'll be able to compete with for-profit alternatives that can focus on developing the best product.
https://blog.ecosia.org/ecosia-financial-reports-tree-planti...