To be honest, I did not saw much cases about people getting caught after long time that they aren't the real owner although saw some topics started in marketplace where they tried to sell account and I saw one site too where they listed accounts (not details) but only rank and price.
I think it was easy before, but after adding 2FA as an additional layer of security in the forum, attempting to hack accounts has become more difficult.. I am certain that those who sell these accounts have somehow hacked them. With the continued restrictions on those who sell these accounts and the spread of fraud cases of people who bought accounts and their seller was able to recover them through the Bitcoin address listed in the sold account or through other security methods or after these people obtained accounts of bad reputation, or after they paid money and got nothing in return, people's certainty has increased that whoever sells forum accounts aims to make money in illegal ways.
If he had a Full, Sir, hero or legendary account, why didn't he use it to earn some money by posting valuable content? Everyone started from the first rank and with time was able to develop his account through effort and high-quality contributions. There is nothing difficult or impossible for those who challenge themselves to succeed, and whoever wants the easy will undoubtedly be a victim of fraud one day and may lose the respect and trust of the community.