Why would Marketo care? Did you check your contract?
Mailchimp has many small accounts and is more a target for scammers, so that's prob why they have such a policy.
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I'd add that I'm sure Marketo would monitor your emails deliverability pretty closely and probably suspend any accounts that raise red flags.
Affiliate links are usually flagged as spam and can get your mailer banned.
what kind of project are you working on ramon?