Currently not making any money. It's a bit of a chicken egg-problem.. Ad networks that offer the type of ads suitable for a search engine want user data, unless you have a significant number of users, in which case they're willing to make a deal.

That's why I decided to build an in-house ad network which is in the making. Hopefully others can use it too, eventually.

The idea is simple.. I know Ecosia has above 1m in monthly profits (DDG significantly more, probably), so in the case where we manage to reach those numbers, we want to purchase river interceptors from the Ocean Cleanup Project. One river interceptor from the OCP costs about $700k. It's estimated that there is a need for 1000 river interceptors to stop 80% of plastic from entering the ocean. Even if we can eventually purchase 12 interceptors a year, that's a big change. I explain this at https://okeano.com/about but probably should add more information and sources!