I don’t think the ISPs and anti-spam vendors have necessarily been silent. They are talking to the providers, individually pointing out that there are customer problems and that the providers need to stop their customers from continuing to spam. It’s not public shaming, yet. I also don’t see it becoming public, I think blocks will just start growing.

To steal from Gen Norman Schwarzkopf: I would characterize that suggestion as ‘bovine scatology’. The best ESPs are aware, perhaps more than anyone else, that when someone indicates they don’t want your mail, the first and most important thing you need to do is to stop sending it to them. And this principle remains sound whether that indication is made at an end-user level or at a domain-wide level. Why would people who are already trying to do all the right things spontaneously decide to start acting like spammers? How would that help?

ESPs certainly haven’t been shy in complaining about what they consider to be unfair practices by ISPs. ISP and anti-spam vendor staff tend to be classier than that, but maybe that silence has been working against them?