What are the most successful strategies for preventing vandalism?
Paywalls work, but remove anonymity.
Graylisting and captchas work for spamming, but humans can trivially bypass them.
Shadow banning works, but only if the user is unaware of their own shadow banning.
Limiting posts a user can make reduces, but doesn't eliminate, graffiti.
I wonder what the efficacy of combining the above would be.