You joke, but we do that in high-risk environment, like driving in Russia (dashcams) or protesting.
Paying by card has saved my butt several times, when I was able to prove to a retailer when and where I bought a product for warranty purposes, or get out of a contract that had 2 weeks 'cooloff' period to terminate but the agency kept playing dumb and 'loosing' all my letters and emails.
