It will require a number of innovations just to solve the formation flying aspect of the system, not to mention the other challenges (listed and not)... good luck with that.
Right, but they're flying them close on purpose - point is, at first glance it looks feasible and the close formation aspect has enough benefits that it's worth exploring further. For me, it's the first time I saw the idea to exploit constellations for benefit within the system (here, communication between satellites), and not externally (synthetic aperture telescopes/beaming, or just more = lower orbit = cheaper).
There are a couple interesting-sounding claims made here but there is basically no detail to be found, which strikes me as odd at best and suspicious at worst.
Yeah it's a bit odd. I can get a sense of what they might be doing and perhaps it's a compelling product but no where near enough info to go on, let alone reserve one for $99 and later buy at $1999.
It adds to a pretty large body of literature around this subject, the gist of which is "risk is going up, but we don't really have a good way of estimating what that means in terms of actual collision rates".
This has been an indispensable resource in my career, to the point that I will frequently search for "<topic of interest> gunter", knowing that he'll have the best collection of information available openly.