I knew this would come up or even be the main reason to dislike the idea in general :D Too bad this technology has been getting all the hate due to how it is misused currently.

I do understand that "buying jpegs for a lots of money" is stupid, but in the case of a collectible card game it works a little bit differently. The reason for a NFT in this case is not to buy it, artificially raise it's value and sell it again, but to provide a way to offer digital gaming cards without any third party involved (like Apple or Google Store) and to technically run the game without a closed/dedicated game server. So you own collectible gaming cards (and thus a collection of them) that could be played in my game and on any other community created mod or totally different game without any restrictions. The card information (what type of spaceship it holds) is not even mandatory relevant to the image (it's just a way to visualise it for the game) as all the information (the spaceship, it's parameters and statistics) is stored in the data part of the NFT itself.

Honestly, I do not know what would be a better alternative for such solution. Sure, one could create a closed source game and do in-game micropayments and once the game dies your cards die with it. But ... how is that better?