This.

But your bubbles are often more highlighted than others and this may seem strange. I can only explain it as a way to easily trace back to a point in the conversation by following your messages upwards, which are easier to remember; this is especially useful in a multi-user chat where the ratio of your messages to the total is particularly low.

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Yeah, it does seem that there is more contrast for your own messages (text, text background to chat background). Often chat messages from other people will match the display dark/light settings, while your own will be reversed. It doesn't seem all that consistent though.