Paragraph 1 shall not apply if the decision: is necessary for entering into, or performance of, a contract between the data subject and a data controller; is authorised by Union or Member State law to which the controller is subject and which also lays down suitable measures to safeguard the data subject’s rights and freedoms and legitimate interests; or is based on the data subject’s explicit consent.

If you send abusive texts through Twilio, Twilio could lose it's contracts with carriers. I haven't read through the paperwork Twilio makes you sign, but I'm gonna guess the fact that this could happen is in there. Also it sounds like the account wasn't banned, it's ability to send messages was suspended. Because it was being used to send spam text messages. I'm pretty thankful Twilio has automated systems for that