I've lately taken an issue with all 7 billion club cards for different stores. Like every fucking shop has their own club card to offer you cheaper shit, and you're just expected to have the card or you'll pay for premium.
Adding an invasive mobile app on top seems like someone pissing over your dead body
The only one of those I do is for the grocery shop, and frankly I'm not even sure why since it doesn't do much. They give me a couple bucks off and a gas discount but only at one shop I'm pretty sure inflates the standard price to accommodate it. Never sent an email or a text bugging to come buy anything though and it's only based on my phone number and could even be an anonymous paper card with no sign up, but no gas discount for the card since it uses the phone number to activate that at the pump.
A nickle off a soda is far from the cost to get your app on my phone.