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Pressure grows on Apple to open up iMessage
(finance.yahoo.com)
This is a most excellent place for technology news and articles.
Two related issues are being confused/conflated here.
The first is the American cultural significance of the green and blue bubbles. This is the thing that Europeans generally don't care about as most are using WhatsApp et. al.
The second is the lack of interoperability between chat protocols such that it degrades the experience for everyone. This is what the EU is targeting.
I don't think the colours of chat bubbles for specific devices as displayed by other specific devices falls under that remit. The implementor must comply with providing the same service level though. Whether or not this will lead to less cultural significance for bubble hues in the US remains to be seen.
It won't be with RCS. The "gatekeeper" criteria applies to interoperation between dominant technologies. RCS has very small adoption in Europe. If iMessage will make the cut it will have to integrate with Whatsapp, Facebook Messenger and Signal.
Edit: I should clarify, there's RCS the standard and there's Google's implementation. Google's RCS is too small to be considered for itntegration. The standard on the other hand would be nice, in an ideal world; however, merging proprietary networks into an open standard is a very high goal and goes beyond what the EU wants to attempt at this time. Instead it will let the tech owners achieve interoperability in any way they want and can.