I'm one of the creators of Skyplane. Skyplane can migrate large datasets between cloud regions at 10s of Gbps while compressing data to reduce egress fees. Happy to chime in!
Congrats on the launch! I had a similar idea once a few years back but failed to materialize it. You might want to consider other cloud providers like Sushi Cloud to get costs even lower. Happy to do an intro if it seems interesting.