If that's the case then why do people raise concern when they noticed that a user changed his/her email? If nobody cares, then account selling will continue on a steady basis.
Accounts sales continue. Now, many telegram channels sell accounts from the forum. The condition for the sale of which is not to change the password.
Here is an example of one purchased account.
There is a rule that is not to change the password after buying an account. I'm complying so this account isn't locked.
If someone wants to sell their account, they will sell it anyway, having thought through the process of buying and selling, everything can be done discreetly.
But all the same, the purchased accounts are calculated according to other factors, which in the end still play against the buyer.