I'm sure you would feel extremely guilty if someone used storage facilities that you controlled to spread CP.
If I didn't know? Definitively not.
If I didn't know? Definitively not.
I think this was the point of the GP asking, "How do I not unwittingly get CP being stored on my device?".
And what about physical things? If you're working on a retail job, the customer buying piece of rope may be planning on using it for tying people up. The guy renting a car may be planning to use it on a hit.
Ultimately, it's not possible to keep track of everything people do with the services we offer.