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You can find the feedback form on the bottom of the search results. Please ask them to consider using Mastodon, Peertube, Loops and Friendica.
Just checked, the feedback form is also available on Desktop searches, also at the very bottom-right corner. It seems to open the same dialogue. Just gave them a small text, that the Fediverse (Mastodon, PeerTube or even Lemmy/PieFed) would open up communication to a lot of enthusiastic people, where there is a large overlap of interest in data souvereignity and ecological activism - the two main selling points of Ecosia.