The other day I thought of that... I was wondering if there would be people walking around with an iPhone 14 with photos taken with the camera of an iPhone 1st gen which they transferred every time they upgraded.
Since i like to search for photos on the map on the macOS Photos program, this can be problematic. So when i was looking for a specific photo the other day, i had to scroll back by date to find it and that's how i found out it was taken on an original iPhone.
Originally it was syncing through iTunes but the past years it’s been iCloud syncing.