Most of the answers here are about games being addictive and a time waste, but what about communication? I actually have no idea about this - is in-game communication in e.g. fortnite able to be monitored?

If not, and if the CCP is as interested in controlling discussion as people in the West think they are, online games are a problem. Youth are supposed to be more impressionable and easily influenced. So, the CCP may just be trying to limit competition.