AWS's new Glacier Deep is actually cheaper than Google's Ice Cold, $1/TB/month.
https://aws.amazon.com/about-aws/whats-new/2019/03/S3-glacie...
https://aws.amazon.com/about-aws/whats-new/2019/03/S3-glacie...
There may also be a minimum storage period, like Amazon has.
Let's wait and see.