I often find this kind of users on the forum and I don't know if a red tag is appropriate.

What is the "general rule" for this kind of behavior?

Should do we tag:
1- sellers of Bitcointalk accounts - Yes
2- sellers of email database - Yes
3- sellers of followers (more followers on social media: fake hype and more stacks on bounties
4- sellers of social media accounts facebook, twitter, telegram or whatever
5- sellers of betting accounts with probably other owners personal data