There are fake Apple Watch Ultras being sold online that have a hidden camera in the crown, but this is just a trick.
These fake watches are designed to look like real Apple Watches, but they run Android instead of watchOS and have a Google Play Store icon.
Authentic Apple Watches don't have cameras and run watchOS, as confirmed by many teardown videos.
To avoid getting a fake watch, always buy from Apple's official website or a reliable Apple-authorized reseller.