Questions about what happens in case of data breach and card blocking

A couple of questions about the curve. All well and good, but I’m more worried about what happens if there is an data breach into their system and they get the data of all the cards you have tied to them?

I’ve seen it allow card blocking. Blocking the card blocks ony curve card, or does it use some API service to actually block the card you are invluded in the app?

In theory it sounds great but I don’t know what they have from this service and trust my credit cards to someone who offers it for free.

The block is on the Curve card only, there’s no way they can block your underlying card.

When an acquirer saves card data, its stored tokenized. Even if an attacker got that data its useless.

The only thing that might be at risk is your personal information.