Hey, one of the folks working on Ente here. Our clients were always open source, we published the code to our server[1] into a monorepo[2] just yesterday.

[1]: https://ente.io/blog/open-sourcing-our-server/

[2]: https://github.com/ente-io/ente

Do said clients have the ability to specify a custom endpoint? Obviously with the clients being open source a rebuild can fix that, but hoping that's not required.

Not yet, there's a discussion about this @ https://github.com/ente-io/ente/discussions/504