You are very wrong about this. Senders of email need to make sure they aren't being used for spam or they get blacklisted.
But then they should have notified me: "We suspect you're using the service in violation of our TOS, so you are suspended" or something like that.
I'm paying for a service, they continued to take my money while pretending to provide that service.
You are very wrong about this. Senders of email need to make sure they aren't being used for spam or they get blacklisted.