With laser inter-satellite links and direct to cell satellite internet services, you can avoid building ground stations across the world.
A low volume of data of VIP customer can be relayed through satellites but doing so will lower the overall throughput and limiting the total number of UEs and their bandwidth. You can do it, but a commercial operator will avoid doing so.
Example, UE1 talks to Sat1 which pass the data to ground station and internet forward. Without this ground station, Sat1 will have to pass on to Sat2 and 3 etc. to eventual ground station. This will reduce the bandwidth and channel resources for Sat2 and Sat3 to serve their coverage areas. The more UEs do this, the more congested the network becomes. Now times this example by thousands Sats and hundreds of thousands of UEs, you get the picture.
That is also why a proper network involves dedicated high orbit dedicated relay satellites such as 6G space section, or G60 and GW are doing.
Remember that the original question was about "great firwall", not only about technical feasibility. It is very important to remember that these networks are operated under national and international regulations. Operators and owners of the space sections are subjected to national laws, they would make themselves criminals if their gateway breaks their license. For example, if spaceX has no operational license in a country but letting its user located inside that country to pass data outside the country, spaceX will be carrying out a crime of smuggling data out of a country, no difference from national law (EU, US, China etc.) mandating all data center being physically within their borders.