What's the use case for this? I run a Nextcloud instance and the Android app automatically backs up photos taken with the stock camera app to my server.

It is waaay faster and supports AI classification (showing photos with a specific person, finding photos with a dog in them, etc), has some editing tools in the client apps, is generally nicer to work with. Its server can also work as a storage for their 2FA authenticator Ente Auth. Everything is open-source, data is E2E encrypted, stored in S3 (can use Minio ro Garage, for example). Uses Postgres DB.