It probably does, and you'll find lots of ISPs, VPS and hosting providers also forbid IRC servers. The main reason for the blanket ban is that once upon a time

It probably does, and you'll find lots of ISPs, VPS and hosting providers also forbid IRC servers. The main reason for the blanket ban is that once upon a time (and perhaps still) IRC servers were widely used for malicious bot command and control systems and it's easier to just forbid them at all than pay people to spend their time sorting the good guys from the bad guys.