I believe that category may have been automatically added, either when the profile was added as part of an older gedcom import, although it could have been added by a member seeing that the profile was never cleaned up after import. It's not likely that the PM or a trusted list member added the category - it's more likely that they either aren't aware that the category is there because if they were aware that the cleanup is needed, they would have done it rather than adding the category to it.
Either way, if you're up for trying to get these profiles cleaned up, you could start by writing to the profile manager(s) to let them know that this work is needed. If they don't respond and you're still anxious to resolve the problem, then you could escalate to the Unresponsive Profile Manager process.