You're absolutely right, but here's a counter point of view. People are not more likely to use Ecosia and click ads than they are to use Google and click ads. Ecosia is trying to give you a "greener" option to something you will do anyway.

But then you're having to ignore an even "greener" option. That's using and promoting ad blocking in general to lessen the environmental impact of consumerism. The thing with Ecosia is that it seems to ignore the damaging impact consumerism has on the environment. Instead, it encourages it by urging you to expose yourself and your friends to advertising.

You could always just donate to tree; https://edenprojects.org/

Eden is around 10 US cents per tree planted.

But then that's up to you, right? Ecosia does not encourage you to buy anything, but if you search for products, it suggests places where you could buy it. I don't get your point.

If I could legitimately help stop or reverse ecological damage to the planet by clicking ads, I would do it all day.

Be careful as click fraud could get them thrown off Bing.