It's hard to believe customers are happy with it. I find it shady if you were to try all the cards I added to the product without my permission.

I'm okay with you sending me an email before you try, as long as explicit consent is given. However, if I don't care to change my primary card after the first attempt, that means I don't really care about continuing the subscription.

Happy to be wrong if you prove it with the data, though.

We do prove it with the data but as mentioned the merchants notify customers before. Thanks