Ao3 apparently. I'm gently encouraging everyone willing to follow Pipermca's link to their reporting page and write a polite request that they please NOT fuck over our fandom like this. LOL! I'm genuinely not ANGRY so much as worried like all hell what this will do to not only TF fandom, but SO SO SO many others too. (Star Wars? Batman? LOTR even!) I can only assume this is a fundamental incomprehension of how fandoms use the All Media tags, so hopefully enough voices will help them at least hear that they need to leave the AMT there and keep managing it even if they can't grasp the WHY of it themselves.