Freenode sometimes does get a lot of abuse, which is a shame. Some networks definitely do have better anti-spam and anti-botnet functionality, but I don't think

Freenode sometimes does get a lot of abuse, which is a shame. Some networks definitely do have better anti-spam and anti-botnet functionality, but I don't think most users ever even notice this. Even on Freenode, most channels will go without problems like botnets or channel takeovers for most or all of their life. If you're running your own irc server, you'll probably never notice anything. If you do, it's as simple as adding a server password (or maybe even changing the default port among some other settings), and anything unwanted will likely be a thing of the past (assuming you don't have dedicated people attacking you). On your comment about IRC bots and services, networks don't see that as something that is up to them. If something requires a U:line or other network privileges, then it's up to the network staff to implement that, sure, but anything else is for their users to do. If IRC networks were for-profit, maybe you could expect them to have things like this and advertise how amazing all of their features are to potential clients. But IRC is nothing but a money sink for everyone involved, and there's therefore often little incentive for networks to implement and integrate a lot of bots and functionality that aren't integral to network operation. Apart from this, spam is a really hard problem if there are resourceful people dedicated to it. Email has existed for even longer than IRC, and despite absurd amounts of work into anti-spam systems and functionality with it, it's not too surprising when spam manages to finds its way into your mailbox. I still agree there's a lot of room for improvement, both at the protocol level and at the user level, though.