Which credit cards do you use for maximum rewards?
My family uses credit cards for all purchases and we pay them off in full each month. Although sometimes we'll use a 0% APR promotion for bigger purchases.
Which cards do you use for maximizing your rewards?
I don't anymore. The rewards are not only in exchange for the return business they hope for, but also partly for the data you allow them to collect on you. It is perfectly fine to make that trade, but it is good to factor that into any pro/con balance you make when deciding what programs to participate in. Seeing what was collected on me turned me off the idea, and I now use a standard credit card without benefits for my shopping.
As commented below: if they do, they are breaking the law, and generally I trust that my bank is GDPR compliant. I have requested insight into the data they have on me and will specifically ask about third parties if I can't find any information in the data dump.
But yes, they still do have all that data stored. There is no anonymity even if my assumptions about GDPR compliance is correct, but my privacy is in that case better maintained because the number of parties with access to the data is limited. Cash would increase anonymity, but cash only is not really viable where I live anymore.
Yes, that someone is the credit card issuer, in my case my bank. However, at least here, these bonus programs are typically affiliate programs where a substantial data exchange takes place between who knows how many parties. For example, one of the most used credit cards in the country I live (which I previously used) is issued by the largest grocery store owner in the country, that owns several of the largest grocery stores. All your purchases are then directly associated with your profile, and they personalize offers and ads. They are also affiliated with a large number of other retail stores, which also exchange data with each other as part of being a part of this benefits program.
As I said, there is nothing wrong with saying "OK, you can have my data in exchange for these benefits". My point is simply that these benefit programs are usually not a case of them just trying to get you to shop with them, but will usually involve data exchange that you may or may not know the extent of. This should be factored in when deciding whether to take part in the programs or not, as it is part of the real cost of using the credit card.
I could most likely find a program that does not as extensively hoard my personal data as the example above, but since the extent of data collection and sharing is often quite opaque, I prefer to limit the number of actors with which I share this data as I don't consider the benefits good enough to make such a compromise on my privacy.
I'm based in Europe, so banks are legally bound by GDPR. There does not seem to be any mention of third parties in the terms of service, and I have never explicitly agreed for them to share my data with anyone after that. So legally, they should not be able to sell my data. It seems to me you are US-based, and maybe finding a credit card that does not by default sell your data is difficult there?
Your comments have made me very curious about the extent of data collection by the bank, though, so I have just requested to see what data they have stored on me. If I can't find any direct mention of third parties in the data dump, I will also directly ask them whether they share my data with third parties, and if so, with which.