They are actually circulated among victims and their friends, with a lot of validation of repeat offenders. So there is a lot of informal collective information gathering and confirmation.
They are lists of men to avoid dating or not trust them to buy you a drink.
And the lists are a reaction to the difficulty of holding them accountable. Universities have been bad about punishing their students for criminal behaviour, because they want their tuition, don't want to offend their wealthy alumni parents, and have a misguided fear of ruining the lives of relatively young people (even if they are legally adults).
Unfortunately some of the people who get away with abusing their fellow students will go on abusing their colleagues the rest of their lives.
So if you want to keep people from being unfairly put on these anonymous lists, then you need to make these lists unnecessary.