They really should have sent a notice to customers since this tool is used by a lot of people to provide remote support to customers, friend and family.
It seems quite ironic that TalkTalk care about scammers, considering they are in the scamming game themselves.
Twice they hijacked my BT phone line without my consent or knowledge and tried to transfer it over to them and on one occasion they succeeded as BT ignored my request to block the transfer. I ended up with no phone line or broadband for several weeks with all my calls going through to someone else.
I had to contact Ofcom to find out who had transferred my line as even BT could not tell me who they had transferred it to, it seems they will just accept a transfer request from anyone without any verification or anything, all they do is send you a letter telling you they are transferring it away unless you stop it.