Sure. But if you have a semi reliable way of getting messages to loved ones either through the distributed net completely or using a satellite hop somewhere, then you have captured a big chunk of what people really want. When you are at home you can just use your WiFi.
At least in my case, I’m just using messages on the road. Obviously it’s not going to be a solution for sparsely populated areas.
If there is a decentralised system that doesn’t require infrastructure , what is left to monetise?