Facebook messenger, WhatsApp, and Signal LLC may be interoperable in the near future.
Facebook was forced by the EU DMA to open up, and is complying without issue. Facebook/Meta will interoperate with services that use the signal protocol. (maybe Google Messages too!)
This is incredible!
It may soon be possible to use a signal client to contact people on WhatsApp and Facebook.
Meta implementing interoperability on the signal protocol could cause signal to become the standard universal messaging protocol.