Good for you.

now understand that fines are proportionate to the offense. Are you engaging in doing very bad thing to personal data on a very large scale and having a business based on this ?

no ? then what are you afraid of ? that failing to answert to one guy asking for what data you have on him will cause you to be fined to bankruptcy level ? I pity the fool as said that one guy.

Your fundamental argument seems to be "this will only affect bad actors" but I don't think the history of law in any part of the world justifies such optimism.

Or how about: I'm sure the advocates for civil asset forfeiture made similar arguments.

If you want to argue that prosecutors on your side of the pond are impervious to corruption, well, consider that you're including Spain, Italy, and Greece in that body politic (at least for now).