[duskwuff]

You are inappropriately equating the termination of a contract with a breach (= a violation) of the contract. The Mailchimp terms of service allow the company to terminate the contractual relationship at any time [1] -- they did not breach the contract by choosing to terminate it.

[1]: https://mailchimp.com/legal/terms/ -- "3. Closing Your Account: You or Mailchimp may terminate the Agreement at any time and for any reason by terminating your Mailchimp account or giving notice to the other party."

[DataAF]

Good catch. Mailchimp has better coverage in their TOS than most I've looked at.

[duskwuff]

Better? Not unusually so. Unconditional termination clauses are standard practice; most terms of service will include something to that effect.