You could avoid most of the binaries by not distributing some alt.* groups, and use existing email filters for the spam. As for making a buck, ISPs could just

You could avoid most of the binaries by not distributing some alt.* groups, and use existing email filters for the spam. As for making a buck, ISPs could just tack on a fee for running NNTP servers. Alas, we have shitty web forums wrapped in ads instead.