I believe the message remains for 30-days after it has been triggered, but I will have to do a bit more reading/research before I can say definitively.
This is true, it is the same if user change e-mail or password as warning to other users that they should be careful when dealing with such users if account is change owner (sold account), or maybe is just hacked. Before of this warning hacker or new user of account could do a lot of damage to other users before DT members red tag that account.