I'm getting really tired of the misuse of the word "censorship" when it comes to topics like this. Mailchimp is not censoring anything. They are not preventing those advertisers from getting their message out. What they are doing is choosing not to partner and work with people they believe might be likely scammers. Something we all do. If you want to complain about that, then you're saying that a person should no longer be able to choose who they do business with. Do you want to be compelled to buy a car from the shady dealer with a reputation for selling lemons? If not, then why should Mailchimp?