Ask HN: What do you think about ecosia.org?

Two days ago, I found ecosia.org search engine. It is true that they use Microsoft Bing (https://ecosia.zendesk.com/hc/en-us/articles/206153381-Where-do-Ecosia-s-search-results-come-from-) to get search results. However, I found the idea very impressive that they use 80% of their profit to plant trees. What do you think about it? Have you used it? Did you like it?