Looking into this a bit more, it's to do with the Game-Key Cards that will be adopted by certain Nintendo Switch 2 games. Basically, when there's not enough room to fit a game on a cartridge, you'll get a makeshift cartridge that has to install the title over the internet - and then still has to be inserted in order to play the game.

Perhaps the biggest controversy of the Nintendo Switch 2 argument is the revelation that Nintendo's flagship games will retail for $80 RRP. That's a huge mark up from the $70 standard today, and will push games over $100 in some territories due to currency conversions, tariffs, and whatever else.