Because there isn’t a single line of longitude that doesn’t intersect with some country and it would be a pain to deal with if it did
i.e. imagine if at home it’s Sunday for you but a couple of miles away, where you work it’s Monday. Or you have an appointment on the 10th, is that your 10th or the 10th on the other side of the line because there is 24 hours difference.
It’s much easier to snake the line around countries and keep it in the ocean.
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