At WordCamp Canada 2025, Automattic CEO Matt Mullenweg called Tumblr his “biggest failure,” noting the challenge of maintaining the platform’s half-billion blogs while it remains unprofitable. Though plans to migrate Tumblr to WordPress infrastructure are on hold, Mullenweg said he hasn’t given up.
the biggest failure was removal of porn from tumbler, they all fled to twitter, and pornhub.
Automattic bought Tumblr after the porn ban.
The ban happened because Verizon was trying to sell it.