Sure, but a petabyte of block storage with redundancy and PIT backups is a poor abstraction to build on, in large part because it’s not a thing that can be built without either paying an wild amount of money or taking a huge performance hit or both. If you do your PIT recovery at a higher layer, you have to work a bit harder but you get far better cost, perf and recovery.

That latter part is a big deal, too. If I buy 1PB of block storage, I’m decently likely to be running a fancy journaled or WAL-ed or rollback-logged thing on top, and that thing might be completely unable to read from a read only snapshot. So actually reading from a PIT snapshot is a pain regardless of what I paid for it. Even using EBS or similar snapshots is far from being an amazing experience.