You can still get BT Premium email but there is nothing premium about it. It is just the standard BTMail with a price tag of £7.50 and as against BTMail Basic, you can use the account on email clients and email apps.
As regards BTMail winding down.
BT stopped supplying an email service to new broadband customers in Oct 2020. They also stopped existing customers who had not started a BTMail account prior to that date from being open an email account.
As most ISPs have stopped their email service it would be fair to assume that BT will no doubt follow suite at some time in the future however there is no official word from BT regarding this so at the moment everything is just assumption.
As regards stating "Free BT accounts are a common target for credential-stuffing attacks. Hackers try old password leaks against them". The problem of having accounts locked or hacked, given the millions of BTMail users, does not appear any worse than any other free email services unless you have figures to show otherwise.
I suspect that the problem is that BT security algorithm is over zealous on some peoples accounts while not on others. This may be because the users who seem to constantly have this problem has been hacked previously or they have opened spammers emails or responded to phishing attempts which attracts further spam and phishing attempts which makes them more susceptible to more attacks and as such the BT security system lock them down.
