For those wondering .000000001% per what? The answer apparently is per object year.

i.e. you could expect to lose 10 bytes of your 1TB every year if your stored it as a trillion one byte objects, but if you stored it as a single object you could expect to lose the whole thing once every hundred billion years, but none of it the rest of the time.

Is that true? How can they possibly measure a probability event so small? If every human in the world was their customer, then .05 humans would lost heir data?

It doesn't mean that either. It's just an SLA. Could have been a number pulled out of the air. Likely loss in real life would be granular at the object level.