Just to let you know. I’ve just heard back from verticalscope. They have deleted my account, and the posts I made have had the username changed to a random number so that I can’t be identified from it. GDPR regulations obviously get better support than being a sponsor or volunteer moderator.
In case anyone else wants to do the same I sent my request to: privacy@verticalscope.com, with my forum username, email and the forum website, and said that:
“I withdraw my consent for you to collect, use or disclose any of my personal information. Please delete my account and remove my personal information from your servers, and confirm when this has been done.”