The problem with no ability to control the group is the maintainers bearing all the spam costs, as spam gets transmitted from host to host so each user can filt

The problem with no ability to control the group is the maintainers bearing all the spam costs, as spam gets transmitted from host to host so each user can filter it individually. (Filter it as a group, and you're controlling the group, whoops.) The arms race in email has done severe damage to many aspects of email -- do you think if everyone stayed on UseNet the problem would be better?