Blacklists are fine. If someone wants to make a list based on some criteria then OK, there is no real way to prevent them from doing that. The people doing the

Blacklists are fine. If someone wants to make a list based on some criteria then OK, there is no real way to prevent them from doing that. The people doing the actual blocking based on the list have the responsibility for their actions. If, say, one of the largest email providers in the world is found to be giving preferential treatment to the email of other large email providers then they can't use some list as an excuse. Their actions are still anticompetitive and generally harmful. We shouldn't forget to go after the entity that runs the email server that is blocking email from our servers. You don't have to care that there is a list. Blame the right people and involve governments if required.