Well there's anonymity from authorities, and there's anonymity from garden variety lunatics.

There exists a grey area between not getting away with nefarious activities, and not having your life ruined by a lynch mob because you didn't approve their preferred CoC on a hobby project or some other perceived injustice.

Is there? The government apparatus that's meant to investigate these crimes is the same one elected by the mob.

If you find yourself a member of any group a campaign can mobilize the mob against, that entire investigatory apparatus can be turned against you.

Without privacy, we are doomed to endless purity purges.