We are an age-restricted site. That means, from a legal standpoint, that we are required to make every effort to check the ages of anyone joining our site. We also have, like every other website, Terms of Service, which are the rules governing the use of our website. We enforce those Terms of Service, unlike many other websites, and we state very clearly, in a number of places, that we are an actively moderated site. For anyone who actually bothers to read the Terms of Service, we make sure they know we monitor all activity on this site. And yes, in order to do that, we maintain records of all actions we take, and of all infractions for which we issue a warning. That is prudent, and good practice.
It is entirely unlikely that we are making any mistake in terms of identifying you. We are well aware of the previous email addresses, previous pen names, previous user names, and other unique identifiers you have used while interacting with our site. We are not unique in collecting this information. You are however free to disagree, and you are free to post your work elsewhere.