One trick Apple uses to make you think green bubbles are “gross”
This seems to be mostly a US American thing, mainly because of the same reasons BBM was a thing: lots of chats over SMS used to be a thing, and then chats over iMessage, which like BBM, you can only join if you have a device from a specific vendor. That means that you can only be in a special social circle if you buy the same stuff. That won't change because of some colours, because it's not the colours causing the tribalism, it can exist perfectly fine without it.In Western Europe, South America and Asia it's mostly just some specific app (WhatsApp for example, or Signal, or WeChat or LINE) and as a fallback SMS. And if SMS turns from one colour bubble to another colour it doesn't really do anything for users on either end. This deep integration with colours and status symbols does remain in specific areas like middle school where it is still seen as important to try to project wealth.