Immich is AGPL-3.0, which I would consider to be fully open-source. They do “sell” it but you’re also allowed to just download it, do whatever you want with it

Immich is AGPL-3.0, which I would consider to be fully open-source. They do “sell” it but you’re also allowed to just download it, do whatever you want with it including removing the key system, so long as you share the source code.