"The grounding series was started by a brainheaded chaotic user name mrlegofan404. He is infamous for his child abuse series named "Brain", then later many people started making grounding videos of their own."
It's apparently a meme even below the level of youtube poop. It's not copied because it's funny. Some people including me sometimes think youtube poop, if done well, can be amusing. This isn't amusing. It's just baffling.