Something that is often left out from these articles is the $230 million acquisition of Polyvore in 2015 [0]. I still don't know the reasoning behind this decision other than the existence of prior relationships with people that worked at Polyvore. From casually browsing the Yahoo Style vertical, I don't see any connection to Polyvore's site and vice-versa.

[0] http://www.businessinsider.com/eric-jackson-slams-yahoo-for-...