Is this something that is considered easy to build locally? When I last looked at the open source options a few years ago it was basically all researchware grade stuff. Amazon is offering this is a production service with SLAs.
I've never built any such system, but I've done some image recognition work, and my intuition is that if you're the kind of organization that needs this service building it yourself will not be a technological challenge.
I was able to use Rekognition to build a custom family photo album for a wealthy family. It allowed them to upload event photos and automatically tag them with the names of relevant family members as well as keywords related to objects in the photo for easy searching. It was mostly a database for building slideshows and selecting publicity photos. Very wealthy family but not such that they would have funded building the technology from scratch. The service made it just about an 80 hour consulting project and most of that was just UI and image gathering.
