1: Costco's major competitor alters key perk policy, risking customer backlash.

2: Shoppers react as rival store adjusts crucial benefit, potential fallout looms.

3: Costco faces challenge as competitor shifts important policy, possible repercussions.

4: Customer loyalty at stake as rival changes key perk, consequences uncertain.

5: Costco's competitor risks alienating shoppers with significant policy alteration.

6: Major store's policy change could lead to backlash, implications for market share.

7: Competitor's key perk shift may impact customer retention, strategic move or misstep?

8: Costco's rival makes risky decision with perk policy, will it pay off?

9: Rival store's key perk policy change generates buzz, potential consequences for brand.