Fortunately mine have not but at a certain point they're useless because no matter no low the scores go nobody in their right mind wants to provide long-form feedback to identity actionable fixes because product teams are usually small even if there are a lot of developers in the pool your pain points will be unique to what your working on.

Yes, this is usually my experience as well. What makes sense for you to bring up identifies who you are. Hardly anonymous. But sometimes I've also been asked to explicitly identify myself as mentioned yet it's still supposedly anonymous.