From what i've seen, it isnt just DALnet suffering from this or from attacks. Altho they seem to be working at getting rid of such things, its a hard never ending battle. Hope you've been sending logs and masks of those you see. Keep in mind that we dont see all that they are doing to fight this kind of crud, altho i've seen many klined for spam, so i know someone is trying. It isnt just up to the admins of any networks, we all have to do our part by letting ppl know to stop clicking on every url they see and to be smart about downloading, as well as reporting the spammers we see. Spam is seriously annoying, and while i agree the networks should do their part, i think each user has responsibility in this too.
A better place to voice your complaints would be on the main DALnet mailing list, which you can sign up for at
www.dal.net.