Anonymous tips are less than worthless.

The first problem is that anyone who is anonymously tipped on is just going to deny it. And not its the word of a named person vs an anonymous tip. That isn’t going to fly.

The next problem is that people will quickly learn to weaponize the anonymous tip process to persecute the people they dislike - regardless of whether the target was even involved in the vandalism.

Policies like these are dumb. They don’t discourage the bad behavior (the opposite, actually, perpetrators know that the damage they do will impact far more people, which is the entire point of doing it in the first place, so this policy actually works as an incentive to do more vandalism).