How do you avoid opaque contracts?
The contract is clear if it says which pieces arrive, whose ad account it is and how you leave. A text is not signed where the platform spend and the studio’s work are mixed without being separated.
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Underline three things: what you receive, what you pay apart and in whose name the accounts sit. When the studio leaves, the ad account is not yours and neither are the pieces. You get a one-page summary beside the contract, with those three lines in floor language.