It's a matter of I don't want to carry the card around with me, and I'm lazy - I'll do all the signup for the convenience of delivery, but just lower prices? - not worth my time - at the counter I can usually whine and convince them to use their "default" loyalty card, and get the lower prices with no "tracking".
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Serious question: Why would you sign up for the delivery with all of your information but not for the loyalty card?
It's a matter of I don't want to carry the card around with me, and I'm lazy - I'll do all the signup for the convenience of delivery, but just lower prices? - not worth my time - at the counter I can usually whine and convince them to use their "default" loyalty card, and get the lower prices with no "tracking".