You can transfer out, but you pay the similarly insane egress costs. Somewhat cheaper, but still bonkers.

Snowball/snowcone, US East

$0.03 per GB ~-> $300 per 10TB

If you're buying disks at scale that's almost the cost of the disk.

Network egress

$0.15 per GB

$0.08 per GB (>150TB/month)

It makes sense for the occassional transfer so you're not paying for expensive EBS storage for stuff you don't need cloud access to.

A screenshot in the article implies that you "Export from S3" https://media.amazonwebservices.com/blog/2020/snow_job_type_...