When Facebook banned blockchain-related ads it was understandable - they are a closed platform and can chose to accept whatever content they decide to. When Google banned blockchain-related ads it was a much more serious issue - millions of websites are supported by Google ads through AdSense and AdX. Google is the main revenue source of the vast majority of publishers on the open internet. It seems incredibly unfair…
Email is the most open API of all, you can send people anything from anywhere using a simple email server so I don't see what the big deal is, especially in dropping a service for doing something that doesn't have any affect on your business at all.