Does anyone want to try to elucidate whatever bull case Yahoo! modeled out to buy it in the first place? Because God knows anyone with a brain should have probably been able to see that it was going to be a disaster.
And Yahoo!, being Yahoo!, never really knew what to do with that acquisition and just let it start to die on the vine, and when Verizon took over, they pissed away whatever goodwill they had left by gutting Tumblr.