These guys are totally ludicrous, the costs of the proposals are quite literately astronomical. The Iridium satellite phone network, which used the kind of technology that these guys are talking about, cost $8 billion to produce and provided the staggering low bandwidth of 28.8 kbit/s. That was admittedly that was 15 years ago but even if the costs are 90% cheaper and the bandwidth is quadrupled that is $800 million for a bandwidth of 100 kbit/s.