The likelihood of a risk in this proxy might be medium or even high according to you
It might be zero. It’s “unknown” (according to me I guess).
I’ve dug into the code a bit out of curiosity - it seems to me that “proxy” is a misnomer. It’s a stripped-down “view” layer built on top of the API. But has the same endpoints as the main immich app for shared things so that you can create links that work with it so it kinda looks like a proxy. But it’s just a “simplified public view” of sorts.
Meh.
Go ahead and try to use it then.