Yes, I read the responses and take action upon them. The last time I quit my bank account to move to a different bank.

Also, I'd recommend sending another request some time after quiting your contract with the company, just to make sure they give you a written guarantee that they deleted all data about you they don't _seriously have to_ maintain.

I intend to use it as well. Since I'm about to move, I wait until I have the new address. Yes, I'm interested what I will get in return.

I also consider it activism to keep companies aware of their responsibilities.

I read them, and often I make decisions based on this — or can use it to convince e.g. my family to stop using payback (a discount scheme where a company logs all your purchases, even cash ones, and you get ~1% cashback).

Why do you think otherwise?