that discussion could be out of context. the rep their may mean "legitimate" coupons from say your email instead of unauthorized copies of existing coupons from third parties.
I wonder what that rep would say if specifically asked about that hfqpdb.com website
Considering how many people shop there and put their emails into the register, there could easily be 100,000x more coupons than actual products to buy in the stores. Managing fraud through authorized emailed is not going to be effective.
Besides, they have tight-controls already through the actual coupon code# itself. The registers know exactly which codes are valid and which aren't. I can cut up a flyer/email-coupon and tape a 25% off bar-code underneath it and it'll get rejected either through expiration-date or exclusion if I tape it under a compressor.
There's simply no way to use these coupons outside of their allowable dates and for the exact products they're intended for. I haven't found a way to "hack" these coupons. If anyone has, I'm sure we've would've heard about it.