This article sounds like sendgrid is the victim. But in reality this is going on since months. My account was hacked three months ago and abused by spammers. There was no way to stop it in the UI and the support didn't react for days. In the end I had to pay ~1k$.

I guess Twilio will close down sendgrid soon anyway and this is a way to monetize the last few months.

Stay away from Sendgrid and Twilio, they are incompetent and/or aholes.