There is no such thing as "estimated fine amount" to base you ransom on. It depends on how important the company treated its security and how obvious the data leak is.
Indeed. Which allows an attacker who is familiar with previous regulatory action to estimate the fine based on the specific circumstances involved in their attack.
But in any case that is not the problem of the regulations.
a) Release stolen data;
b) Anonymously supply the regulator with full details of the leak
unless a ransom was paid, I imagine that the threat of an audit and potential regulatory action would be enough to persuade the company to pay the ransom if it believed the cost of the ransom to be lower than the cost of an investigation by the regulator.
Or they could pay the ransom, which they deem to be less expensive than dealing with the regulator, and improve their data security to ensure they don't get caught out again.
I fully understand (and support) the reasoning behind GDPR; I just think that in this case there is a path which is easily open to abuse by attackers.
One might as well ask
> Why does anyone stay in business in CA?
since (I believe) Californian state law has similar reporting requirements (and fines/civil liability) for breaches.
Nor the US where, for example, Target paid millions in a settlement for getting hacked.