The CEO of Tumblr David Karp made unilateral decisions which stifled its growth and utility. Any additional decision making input would have helped here, but qualified women, minorities and people accompanying David, Fred (the author of this article) and Marco (1st engineer) would have greatly helped so the winds here. Be more in tune with the audience that grew.
After the second sale to Verizon, after David left, different leadership could have understood how the erotic content community was flourishing on Tumblr in ways that the erotic industry has failed to attract. Many women liked tumblr for porn sharing, browsing, and curating because other porn-specific sites have unclean interfaces and distracting ads. There were people that could have told them that in the decision making process, and helped navigate the issues encountered since that is what was driving engagement.
Automattic also seems to fail to understand this, with CEO Matt Mullenweg's explanation seeming to complete miss the point, and looks more like a pet project than any interest in engagement.
You know in which ways.