Is it your prediction or what? Do you have any proof about this services and his ban reason?
I saw threads posted by OP himself related the so-called ban of crypto/bitcoin-related accounts about
ConstantContact and
SendInBlue. But upon searching in google, I didn't see any article related to this except for the mailchimp which I mentioned already.
Because of many ICO scams, all paid advertisements are now under observation. I am not sure for Bitcoin specifically.
Yes, mostly it's because of ICOs or any investments schemes not in bitcoin particularly.