sending messages into space hmmm I don't fully believe that, because bitcoin blum is fully in the world is obliged to understand bitcoin in every country but they send messages into space, I guess that's impossible.
I think you're taking the sending to space part a bit too serious. All that's happening is you broadcasting your transaction to a satellite and from there it bounces back to whoever you sent your transaction to.
It allows you to use Bitcoin without needing an internet connection, and that's the main advantage here. It does require you to have a hardware setup, but with time these setups will become more user friendly and cheaper.
I haven't tried it yet, and I probably won't ever have to with how solid the infrastructure is in Europe, but in certain countries this is definitely a useful feature, especially with oppressive regimes censoring everything.