You are trying to draw a bright line that doesn't exist. Individuals can (and do) use mailchimp to expand their reach to a broader audience, and moneyed interes

You are trying to draw a bright line that doesn't exist. Individuals can (and do) use mailchimp to expand their reach to a broader audience, and moneyed interests can (and do) use platforms like twitter to push their message. There is no policy you can write that takes into account the ulterior motives of platform usage. The motive is always "reach an audience".