That's not how contracts work; just because you CAN sue someone doesn't mean you MUST. Nor does not enforcing against one party mean they can't against another.
A contract to do something illegal isn't enforceable. You can't make a contract that says you can't go to the police (or other authorities) to report someone breaking the law.
Without the ability to sue for a breach, there is no reason to have a contract in the first place. The terms might as well say "each party can do whatever they want at any time."
That's not how contract law works. There are lots of laws relating to contracts that are, at least ostensibly, there to stop abuses of power from one party over another.
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