I’ve just done a post-revert tidy on roads that still had building=yes on nodes (which happened when they started re-adding them while the revert was still happening). There are still some rogue building=yes nodes on area=yes objects that are probably buildings, but these need properly reviewing.

https://www.openstreetmap.org/user_blocks/2616 Ends in 1 day and after the user has logged in.

This suggests they may have given up, at least for now, but we’ll keep an eye on future edits. The problem with new users’ use of JOSM is that without adequate training it’s like giving a machine gun to a toddler - bad things can happen very fast.