I'm not too sure how this would benefit the streamer in anyway, as if you are watching their stream, you'd know where they are and who they are anyway, so it cannot really prevent stream sniping or anything of that sort.
It's not your responsibility to protect other players, if they cannot follow the rules, that's their own fault, not the one streaming.
If you don't want to report them for doing something, then simply don't report it.