They clearly are? It seems like GitHub users submitting a PR could/can add a `preview` label, and that would lead to the application + their changes to be deployed to a public URL under "*.immich.cloud". So they're hosted content generated by users (built application based on user patches) on domains under their control.
Ah, then that's a different situation then, sorry for misunderstanding the context and thanks for clearing that up! I was under the impression that Immich accepted outside contributions, and those would also have those preview sites created for their pending contributions.