[c7b]

Not Canadian, but this seems hardly surprising to me. I once learnt (not the hard way) that contract acceptance can be highly implicit and doesn't even require any utterance, verbal or written, as for example in handing an item to a cashier, raising your hand, handing over a set of car keys, all in the right circumstances (those were all examples used). A thumbs up emoji, in response to the direct question 'Please confirm this contract', seems like a natural extension. And if it's used in a communication channel that was previously used for establishing contracts that were also honored (ie considered binding) by the farmer, I don't see how this case could have gone any differently. It doesn't mean that every thumbs up emoji is binding, just like taking a car on a test ride isn't. So 'Hey, can I have all your stuff?' followed by a thumbs up on Sat 3am of course won't be binding. But in this case, the context seems pretty clear.