Not just AWS. IIRC, GCS and ABS are slightly cheaper for storage but more for egress. To be fair to them, their reliability is pretty much second-to-none, whereas many of those at the very cheap end pretty much just ran a Ceph/RADOS cluster and then wondered why they were having lots of problems with reliability -- but with things like RustFS becoming more and more popular, the object storage racket is long overdue a shake-up!

We run Ceph at work. Reliability problems have been exclusively caused by us penny-pinching and trying to have as few drives and servers as possible, causing latency issues. If we had a nice margin instead, I can't see there would be any problems.