A satellite constellation is only half of a network. And a system that nobody can actually use is not a useful or functional system. Approximately nobody has a receiver for this network today. The receivers won't fall out of the sky tomorrow if war breaks out.

And even if everyone did have receivers, commercial satellites are highly regulated by most nations, likely will be targeted during any future major war, and there's no guarantee they won't be coopted for other uses by their host nations. Blockstream is a tiny company and doesn't even own or operate any of these satellites. You might as well just use viasat or iridium.

If people need to put in that much work, it won't be of much use to buy groceries with it, as the kid at the grocery store can't even spell SDR. If it were me, I'd spend my effort rebuilding terrestrial IP networks over copper instead. It would be more useful.