RTN's focus on freedom of speech while condemning Mailchimp's actions is absolutely meant as an equivocation that tries to apply Constitutional protections in an argument where they don't apply.
And your comment does the exact same thing only more explicitly. The First Amendment has absolutely nothing to do with this issue. And it's very telling that people would prefer to focus on platforms regulating their content and "cancel culture" than addressing the very real and consistent attacks on the First Amendment by the current administration.