Even though the user can just be tagged directly with a feedback of "offers to trade merits/buy/sell accounts through PM", there are chances that a non-DT member would come across users like this and their feedback wouldn't be directly visible to many users.
People tagged other if they share/public their private PM which may contain confidential information. I would also hate to see someone sharing a private PM to the public if I wanted to share that information with only a few people.
If it contains sensitive information, just encrypt it just like the note says before sending a PM/DMQuote
Note: PM privacy is not guaranteed. Encrypt sensitive messages.
