Smaller search platforms like DuckDuckGo or Yahoo still have real users searching every day, and the competition on those platforms is much lower than Google. That means you can sometimes get cheaper clicks and reach people that bigger advertisers are ignoring. The audience sizes are smaller, but the cost savings can make it worth testing, especially if your budget is tight. It is not a replacement for Google, but it can work as an extra channel. Have you ever tried running ads outside of Google or Bing?