Numerically, that's incorrect. Tumblr includes posts-per-day stats on their /about page, and banning adult content was a drop of about 20-25% of posting volume.

Numerically, that's incorrect. Tumblr includes posts-per-day stats on their /about page, and banning adult content was a drop of about 20-25% of posting volume. While that's a big drop for something that was an overnight change, it's still dwarfed by the drop comparing current stats vs heyday stats of years back. At peak, going by public posts/day stats, Tumblr was about 5x larger than at present. It was more of a slow bleed than a sudden drop-off though.