If they let you give them a phone number, I always use (in the USA) my area code plus 867-5309. So far it has always work. Younger checkout people don't see anything unusual and older ones get a laugh out of it.

At my old group's monthly meetings we'd all chuck our cards into a hat, stir them around to randomize them, and take them out again.

If you know anyone that has a card, ask them can you use it or ask in local groups. On reddit people used to share pictures of their clubcards so other people could scan it when they shop. The card holders get loads of extra points and the people that use the cards get the discount and privacy, win-win

Fake details and don't use the app should do the job.

Along with all the comments here, always use cash with the card too.

Once you use a credit/debit card with it, they'll have an association.

standard is treat them the same way you used to treat Netflix logins – one club card number gets shared among family and friends

EDIT: no one ever used their own Netflix login and no one ever uses their own club card number

They can and do associate cards with vehicles and use facial recognition. any attempt to circumvent the data harvesting is a waste of your time more than theirs ... for loyalty point cards.

People in this thread seem to have base discount cards, which are perfectly fine to swap around a group but points cards tend to have a bulk discount that accumulates over time and swapping would be a very bad idea.

My buddy used his pet pig's name. I generally use my first name with last name being the name of the business. Emails for each also unique.

If I have more items with club price that would make a larger difference, I just quickly register a new one-use account with disposable email and random address in the app, and delete it afterwards

You could just give them fake personal information. In the end, if they really want they could identify you because you probably pay with your card?

I wouldn't

The whole point of giving you the discount is how they pay for the data. It wouldn't make sense for them to give you a discount without getting the data.

I was accused of stealing by a self checkout machine 3 times in 2 weeks. Discount card or not I'm shopping at the more expensive knock off whole foods instead. Fuck kroger. (I was still stealing apples. Because fuck kroger)