[Canada]

It wouldn't have regular routing with Earth. The latency would break everything.

Mars would have its own internet and the first key application would be a send and recieve queue system to connect earth.

This would basically be a REST api that lets you send files, receive notifications of files sent to you, and download them.

It would definitely be paid or metered. I'm sure the first one would be vertically integrated (app owner exclusively controls the communication link) but future versions would probably allow anyone to bring the link to earth... a 2 sided market.