We can't compare companies with each other since we have no idea what kind of deals they have negotiated with the cloud vendors. On Apple scale, you most certai

We can't compare companies with each other since we have no idea what kind of deals they have negotiated with the cloud vendors. On Apple scale, you most certainly are not paying the list prices. Quite certainly the same thing for Dropbox, but Dropbox might have had worse negotiation position. Initially, they started small and then were quite locked into AWS. Maybe AWS did not believe they would actually be able to move away. Since Google is working to challenge AWS, it probably makes sense for them to strike deals with companies like Apple with even small profit margins if this increases their efficiency and allows them to then make more profit from other customers. And then we also have the option that Apple simply can't build own data centers fast enough to accommodate all their needs. Encrypted storage blocks are a safe thing to distribute, so rather distribute those than some Siri voice recognition stuff.