I have an issue with Tangem cards.

They come in Pack's of two or three pieces.

The issue I have is: In order to have 2-3 cards with the same private key, the private key need to be pre generated and written on both/on all three cards, from here start the problem, who stop the person that write those private keys not to do a back'up of them "for later usage", or the machine in case of automation, to do back'ups of those private key's.

Is something like: "Trust me bro, I don't do back'ups of those private keys"

A similar situation is when people buy Trezors and Ledgers preinitializated with private keys from eBay, I am wrong?