Use Default Name Color Behavior (/color Default)
The default behavior for name colors seems to be that it temporarily chooses a random color for you each time you join chat, but this behavior is permanently lost once you've chosen a color. There's no option AFAIK to regain this functionality - the only way to apparently have this chat "color" is to use an account that's never chosen one.
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fakeghostpng
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Hello there, you can change your name color in chat in your chat identity settings! More information here: https://help.twitch.tv/s/article/chat-basics?#settings