I definitely understand the desire to not have one's IP tied to their search history/browsing in some cases, but as this service makes no mention of being an anonymous or private search engine I don't think your critique is an actual issue with the service. Your use case simply doesn't match the purpose of this search engine

You're right, privacy is not their selling point. But they do have many phrases like "We don’t store your searches permanently" and "We don’t sell your data to advertisers" in their website, which are technically true but I misunderstood that they don't store my IP either because of those. I came across the text I quoted in the parent comment months later when I came across a thread in r/privacy and I passed it on. StartPage and DuckDuckGo still makes money from ads and doesn't share user IP. It would have been great if Ecosia functioned similarly, and in that case many people like me who are concerned about sharing IP with Bing(or other services) can join Ecosia for search.