The problem here has less to do about YC maintaining a list and more to do about the people reporting incidents to YC. Sorry, but people are ruthless, and I can see this being abused by founders who may feel vengeful they didn't get funded.
If the list was based on convicted sexual harassers, then so be it, but if it's based on feedback reviews, it'll be ripe for abuse. This is going to have tricky sociological impacts in the VC community that won't actually solve the problem.