Part of the problem is a lot of math is taught as pure theory. Unless you're one of the few people who finds math theory interesting on its own, it's soul-crushingly boring to someone with ADHD and feels like you're being taught how to waterboard yourself. It didn't help that my math classes were invariably taught in the oldest building on campus which probably had a single functioning AC unit. Physical and mental torture.

I managed to struggle through it, but only because I found physics interesting and it forced me to learn the underlying math well enough that I could progress to the next level.

Yea, nothing prevents them from fetching the pre-edited content from their daily or weekly database backups. Media such as images and video might be harder to restore, but "soft" deletes on that type of storage are common, and editing a comment to remove an embed won't delete the embed source.