Some wm employees feel powerful being able to exercise this in a frustrating job. Its kind of fun for them to be at least somebody's boss. If they want to see the card then no amount of hiding is going to work.
I just went and dumped 2K on 2 discover cards and the employee didn't even flinch. it's very hit and miss.

On the way back stopped by walgreen where I get fee free GC and I told the employee hey you are running low on these cards, you might want to reorder. She said yeah he(manager) must be doing it. then she told me about we have to give you this fraud warning, I said, I know I have seen this many many times and dont even bother to read it. she said apparently there is fraud going on with these cards and I told her I never have to deal with it because I send these cards to nobody and she said oh yeah you use it yourself. some reps are just not zealots. they are easy to go along even when sometimes they would decline you because they were told to.