Stationary orbit is at a distance of 35800 km above sea level, which implies a one way latency of 110 ms based off the speed of light. Since any request from a user requires a total of 2 round way trips (one for request, one for response), the minimum latency for a request is 440 ms.
Avg latency with fiber is something like 30-60 ms, so we can assume an average request with Astranis will have ~500 latency.
Most modern webpages will not be able to support such latency. Astranis will need to essentially cache webpages on demand and deliver them to the end user as a fully rendered page, which will introduce security headaches.
I don't see why Astranis chose this vs a lower orbit.