There are supposedly psychological effects in using green at all, and there is also a known controversy over green bubble used on iOS bundled Messages app[1][2]

There are supposedly psychological effects in using green at all, and there is also a known controversy over green bubble used on iOS bundled Messages app[1][2]. As for "should", not sure about that... 1: https://www.wsj.com/articles/why-apples-imessage-is-winning-teens-dread-the-green-text-bubble-11641618009 https://www.wsj.com/articles/why-apples-imessage-is-winning-... 2: https://uxdesign.cc/how-apple-makes-you-think-green-bubbles-gross-e03b52b12fed https://uxdesign.cc/how-apple-makes-you-think-green-bubbles-...