Please see the above post as our policy department will handle those requests.There's plenty of posts in the buy/sell-section containing personal information like location and email address, so a half-assed "anonymizing" won't cut it for GDPR compliance for the many opt-outs since new site management took over...
For EU citizens there's always this site to file a formal complaint against the site, will do so if nothing happens:
complaint_mini.jpg The EDPS is the EU’s independent data protection authority. We make sure that that the fundamental right to the protection of personal information is respected by the EU institutions, bodies and agencies (EU institutions). Complain to the EDPS We supervise ...edps.europa.eu
Users also have the ability to edit posts if they want to remove any personal info.