Wikivoyage has disappeared from DuckDuckGo

There's a lot of results shown on the page, but the takeaway is that results linking directly to any page on Wikivoyage have completely vanished from DuckDuckGo. Completely different results compared to DuckDuckGo. Wikitravel is the original project and a schism in the project resulted in the creation of Wikivoyage, with Wikivoyage taking the mantle of being the more active project over the last few years. So we have three search engines: DuckDuckGo, Yahoo and Bing from where Wikivoyage has completely disappeared. There's a way to get Wikivoyage results on DuckDuckGo, by using the site: operator. Wikivoyage is probably blacklisted at Bing's end for some reason and that percolates downstream to both Yahoo and DuckDuckGo. That doesn't explain why DuckDuckGo can return Wikivoyage results with the site operator while Bing doesn't.