For the people asking about Sup, I've put it on hold pending the new EU laws that require interoperability with large platforms like WhatsApp and Signal.
I'm still working my way around the new laws and requirements so Sup can take advantage, but it requires some refactoring to be compatible.
I think @supapp has the potential to be a game changer for the fediverse, but I want to get it right.
After Loops, I plan to publish the app client + server, likely in May.
@dansup @supapp it's the other way around - large players (from a specific list) are required to make their services interoperable if a smaller player requests it.
neither Whatsapp nor Signal are forced to connect to each other, but if Signal wanted to be able to message Whatsapp accounts*, Meta is required to have a way of doing that.
*Signal has already commented that they're not interested in doing that.