I miss chat rooms that do not require registration or runs megabytes of (third-party) scripts in the background. (Unpopular opinion: I don't like IRC, sure it's great but has weird oldschool measures (forces you to stay active, anti-spam for guests newcomers trigger by accident) and you might end up missing out on previous conversations, I can say it's definitely better than Discord when it comes to moderation and its light use of resources)
Might be a waste of time but sometimes they share interesting stuff I wouldn't find myself.