Overall, I think the app sounds like a convenient and easy way to send gifts to friends and loved ones, especially during the holiday season. The fact that it only requires an email address and doesn't ask for anyone's physical address is definitely a plus, as it adds an extra layer of privacy and security.
One potential downside to consider is that the app is only available on the web, so it may not be accessible to users who prefer to use mobile apps. However, this may not be an issue for everyone.
Overall, I would recommend the Surprise by Gift App as a simple and convenient way to send gifts to friends and loved ones, especially during the holiday season.