Google owns all of the spam filters used by 99.9% of all email providers. If they don't like your content, the majority of your intended audience will never see it. This isn't including search traffic. They regularly censor news organizations without telling them.
Recently, Mailchimp announced that they will block any content they deem unacceptable. They get to decide what your recipients will see.
Payment providers like Paypal and sites like Kickstarter also regularly ban people they deem 'unacceptable'.
The phone company isn't allowed to block you because you said something politically incorrect to my friends and tech companies should be no different.
The tech community isn't protesting this right now because their perceived enemies are being blocked and censored en masse.
Don't be shocked one day when you are censored and blocked and people like me just don't give a shit anymore