It was reported to me, and I confirmed, and so can you, by making a new account on sendgrid.com with an email such as plaestine@mydomain.com
Instead of a verification or welcome email you immediately get an account closure and violation of tos email.
Irrespective of the politics, such a crude filter is not a good look for Twillio who owns sendgrid.
I did not check if this is the case on Twillio it self.
Responding to the ticket has not revived a response automated or otherwise.