WhatsApp is rolling out its interoperability features. There are three providers that are actually interoperable in the EU today: BirdyChat, Haiket, and Arnacon. None of them offers group chats with WhatsApp contacts as of now, which is a major obstacle for adoption, but at least there is something happening.

However, under DMA, Messenger is required to do the same. And yet there is nothing. Is there any reason no one is trying to launch a Messenger interoperable app? Lack of monetization incentives? More technical obstacles than with WhatsApp?