Well firstly case ruling is more thumbs up emoji does count in this very specific case*. It isn’t universal ruling, but very specific ruling tied to the circumstances of the case regarding existing business relationship, previous communication about the contract, the actual sending of contract and then being asked to confirm he is happy with the actual final contract and confirms it. Process that had happened many times before regarding various produce delivery contracts. Only this time he messaged back thumbs up instead of writing into the chat “Yeah, I agree”, “that contract is okay” or so on.
They now argue, no i just thumbed up on “I received the file”. But court said, you were specifically asked to confirm and displayed positive signal. Reasonable person could assume you meant “Yes, I confirm”.
So no not every thumbs up is contract agreement. Someone sends you out of the blue a contract and you message back thumbs up, it isn’t contract agreement. context matters.