The biggest mistake was to shutdown their own search engine, and pay for Bing search results. And their Ads-deal with MSFT wasn&#x27;t that long-term successful. Yahoo had the biggest Hadoop cluster back in 2009, the were at the forefront of big data and contributed to many open source projects. Then everything went downhill.<p>Now Yahoo has what? Flickr, Tumblr, Mail, ...? Right, they own a stack of Alibaba (China), and now close or sell everything else. Sad, hopefully Flickr, Tumblr and some other good services survive.