Re: Maths
So what though? If talk talk weren't so bottom barrel then this data wouldn't have been leaked yet again.
Ultimately, investing a absolute bare minimum amount in actually securing data should be cheaper than not doing so. If failing to do so means you have to push prices higher than the competition to cover fines - I'd call that the system working as intended.
Talk talk going out of business: shame for many of the employees but the overall market size doesn't shrink so hopefully most could find jobs at those competitors that take their share and do give a crap about complying with laws.
This idea that fines are cheaper than complying with laws is a major reason this country is in the toilet (or at least swimming in sewage).