Maybe we're wrong but for the moment they're not interoperable.
But the new European DMA regulation requires platforms to be interoperable. Meta and Apple are obliged now to open up their apps to communicate with smaller rival apps such as Signal. Apps using XMPP may be allowed to communicate with other apps in the future, although this seems to pose some security risks.
Some information about the requirement for interoperability between messengers:
@Valmond @jerkface
Maybe we're wrong but for the moment they're not interoperable.
But the new European DMA regulation requires platforms to be interoperable. Meta and Apple are obliged now to open up their apps to communicate with smaller rival apps such as Signal. Apps using XMPP may be allowed to communicate with other apps in the future, although this seems to pose some security risks.
Some information about the requirement for interoperability between messengers:
https://www.eff.org/deeplinks/2022/04/eu-digital-markets-acts-interoperability-rule-addresses-important-need-raises