In germany there is an imprint requirement so you'll always have a contact point for these things.
Unlike WHOIS it's on a website so you can protect this information much more easily from scraping and spamming.
Unlike WHOIS it's on a website so you can protect this information much more easily from scraping and spamming.
Plus I'm fairly certain providing temporary mail addresses (with decent lifetime) would also be okay.
Specialised Lawyer isn't quite right, a business that competes with you needs to file a complaint (IIRC from law course).
From what I understand the eventual plan for WHOIS to only allow access if there is truly legitimate interest. Everything else can be filtered over the registrar.