Now the European Union recently announced a rule in the Digital Markets Act (DMA) to require messaging app developers to enable their apps to interoperate – that is, to make them work together.  For example, if I’m a WhatsApp user, my message might be received by an iMessage user, if that user does not use WhatsApp. Additionally, if I’m an Android user with RCS, my message could be received by a Telegram user or even an iMessage user.  There could be endless combinations.