Honestly, and this is me speaking personally rather than on behalf of the team, I really don't feel that it's an issue. If someone raises a complaint about another player, we're not going to do anything without evidence. A complaint might cause us to look into it and maybe ask other people if they've had any experience with the same. If they say "Yeah, actually, player X does Y a lot," then the complaint is a valid one and it's good that it was brought to our attention no matter by who. If they say "No, I've never seen player X do Y," then we just say "Sorry, we don't have any evidence of that behavior and can't act on it" to the anon in question.

If a concern or complaint is valid, it doesn't matter who brought it up. If it's not valid, then we won't act on it. It isn't like the anon suggestion box is a command saying "Do this."