But again, the scheme you described is unlikely to be accepted by spammers. It requires costs (advertising relay + time and effort). If they do all this, they are heroes. They will raise a hen laying golden eggs, which it would be strange to kill. Most likely they will be re-educated and stop being spammers. In addition, it is easy for users to disable the relay. If it is closed, the user can accept this fact for himself as a temporary subscription that has ended.