Welcome to China+ ! In Japan they're also debating mandatory ID for Internet cafes. They have soft guidelines that no one follows because it's bad for business. Cafes here don't let you just plugin like in Europe. Also comes with tons of manga and passes to online games and seedy paid sites.
The rationale is that IDing prevents crime. However, it's also how a controversial coast guard video was leaked when government was being incompetent as usual.