And all three of them are no longer 'successful' at effectively delivering messages because users of those systems are drowning in spam. It completely blows my

And all three of them are no longer 'successful' at effectively delivering messages because users of those systems are drowning in spam. It completely blows my mind to return to the US and see how bad phone and SMS spam have become. The spammers have now become so effective at parasitising the transmission channels that they have caused them to go into decline. It is easy for spammers and scammers to exist and thrive as parasites in these systems for exactly the reasons stated.