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A key difference is that MailChimp is invisible to the end recipient, while surveymonkey.com links are not.

They support a whitelisted research.net domain, but genuinely curious why the name has negative connotations.

A monkey is someone dumb. Isn't a survey monkey someone dumb who takes a survey?

Spank the monkey...

Depending on where you live, calling someone a monkey can range from mild to terrible insult implying stupidity through to full on racial epithet.