>If you walk in to Walmart you don't automatically think you're sharing your shopping habits with thousands of other companies who pay for that data.[1] Isn't

>If you walk in to Walmart you don't automatically think you're sharing your shopping habits with thousands of other companies who pay for that data.[1] Isn't that exactly what membership cards for stores are for? Isn't credit card data also sold in a similar way? I find the credit card one to be a much bigger problem.