In my mind:

The messages of the others should be the easiest to read. So, if you go for a flashy accent color (which can and probably should be questioned) you give it to the less common messages of yourself.

Good question tho, because you'd think the left right difference for the bubbles would suffice.

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I gotta say, as strange as it is, it works somehow. I'm very used to it and reading it is easy. But it doesn't make intuitive sense.