Isn't that effectively "putting all your eggs in one basket"? If Amazon changes business models at some point in the future, or is breached somehow, they'd have

Isn't that effectively "putting all your eggs in one basket"? If Amazon changes business models at some point in the future, or is breached somehow, they'd have a goldmine of information about you. If you split up your shopping at least each individual shop has less incentive to reveal your information to competitions shops.