How Yahoo derailed Tumblr

I personally don't think Yahoo did anything much to Tumblr. Before the acquisition, Tumblr as running out of money and needed to either raise more, or get acquired. They hadn't generated much revenue or profit before that.

Tumblr's failure to generate revenue was its own. And the only person responsible for its flailing product and declining growth is its CEO David Karp, who has been leading since the beginning.