I found elsewhere these are meant to fly only ~1500km above Earth. This means a radio link would be probably less than 6000km (you will not track fast-moving satellite all the way to horizon, so likely distance will be even less than that - which is exactly the reason why so many satellites are needed). This distance translates to 20ms. Add another 20ms for connection from satellite back to Earth and you have 40ms overhead, at most. This is much better than 35,800km for geostationary orbit with round-trip latency ~240ms.
I think all satellite internet providers are currently using only geostationary orbit. A large number of low-flying satellites is definitely breaking the mould.
Biting the hand that feeds IT
