Amazon Prime members were previously able to share two-day free shipping with four other adults, but Amazon has now made some changes to the way members can share this service. Free two-day Amazon Prime shipping can now only be shared with one other adult, so no more sharing it with friends I guess.
Amazon’s new policy says that only one other adult can be added to a Prime account and the primary account holder has to be okay with the other adult having access to their credit or debit card that’s on file. So obviously you had better trust each other.
The other adult that you share it with can add their own debit or credit card to the account but the payment method will be visible to both people who share a Prime account. This is now a mandatory requirement for sharing Prime accounts. Previously the company required all adults on a Prime account to have the same shipping address, so the restriction was rarely enforced. Obviously now Amazon wants Prime sharing to be limited to two partners or within the family instead of being shared with multiple friends, which is understandable.
This change doesn’t appear to be retroactive as far as we know. So you and the other four adults on your account having nothing to worry about if sharing was set up before today. Prime members can still add four children to their account and they won’t even need dedicated Amazon accounts to stream content using Prime Instant Video, so that is unaffected.