I'm not disputing any of that but the idea that you can trust what you read on an app like that is the issue.

Trust is a hard thing to come by online, even when people aren't anonymous and speaking publicly (Facebook or any other online place where one might use their real name). Giving people the cover of privacy from the person they are reporting about isn't going to increase the veracity of what's posted.

We already know how people behave online. It's either naive, ignorant or negligent to think otherwise.