Why is there a camera inside the shuffling machine

Nvm, it’s in the article:

They found that the Deckmate 2 also has an internal camera designed to ensure that every card is present in the deck, and that they could gain access to that camera to learn the entire order of the deck in real time, sending the results from their small hacking device via Bluetooth to a nearby phone, potentially held by a partner who then could then send coded signals to the cheating player.

My YT account is like 10 years old, so my subscribed tab is a mess.

Also, i like seeing what youtube throws at me cause the algorithm is actually quite good.