It doesn't seem different from how, say, WhatsApp is used in some places to spread "news".

The potential for abuse is big. What sort of curation will be done?

Right now, I can safely say that 90% of everything I get in popular WhatsApp groups is fraud, misinformation, fake news, baseless accusations, harmful medicine advice, etc.

Maybe Bulletin will be exclusively focused on events and they'll have a better time curating that.