https://techcrunch.com/2021/10/04/amazon-will-allow-u-s-prime-members-to-send-gifts-using-only-an-email-or-phone-number/

In preparation for the holiday shopping season, Amazon today convenient a new way to send gifts through its mobile app. Instead of entering in the recipient’s mailing address — a piece of information people often don’t know in today’s age of digital communications — Prime members can now send a gift to a friend via their phone number or email address.

The feature works by offering an alternative to entering in a delivery address at checkout. If you don’t have someone’s address, you’ll be able to select a new option that says, “Let the recipient provide their address.” You then enter in the person’s email address or mobile phone number.