Account trading should not be tolerated after the introduction of the merit system. A trustworthy individual would not engage in buying accounts and would instead focus on being a valuable contributor. Good contributors do not need to purchase accounts; they can easily build their own.
I think it's a good idea. Accounts that have changed hands as from February 2018 should be red tagged, while in the previous ones it should not be an amnesty in my opinion, but see each case.