[bmn__]

> If you have any other ideas for forum admins to make their forum respect privacy better, I'm interested.

Tell the software vendor! They need to supply sane and private defaults, so that every admin who deploys an instance benefits automatically.

You could drive home the point by saying that if you were to run the software in the EU, it becomes a ticking time bomb and is an invitation for getting a forum admin into obnoxious manual cleaning work at best, legal trouble at worst.