Yes or they could have just blocked the messaged before it hit my system. They are the ones that originally allowed the message to get to me. Then when I process it, they suspend my account.
It's probably a good idea for twillio to be more reachable to any paying customer, at least until a human employee makes the determination if the customer is a spammer.
I also understand and agree with your argument about why they might have done what they did. But I still needed to counter with what I did in order to protect my business.