Debit cards costs less money to shops and so on (transaction cost). Maestro system is way cheaper than anything else.

Credit cards are annoying that your balance isn't updated immediately, they're much more costly to operate, more fraud tolerant (just need to copy the numbers) while the benefit only applies to US and maybe a few others. Meaning, any bank here will pay you back regarding debit card fraud similar to the other response.

Credit/debit cards; it's weird that having such a card results in so many differences other than paying on credit/debit.