it's an IRC network aimed at gamers where 98% of channels are public and free for anyone to join without any form of authentication ever.
so you'd be more accurate to say it covers 98/100 of cases, and we leave the other 2 open
the main obstacle these days is that a secure PKI deployment for a network ran by 40 different companies with no legal structure is a hard problem, not the technical challenge of putting a cert in your ircd.conf