Highly illegal, they use (some) magnets that look like a quarter, the magnetic quarters will all stick together (like you watched happen with the $50). while making a make a log jam in the middle of the tray while other quarters move around the outside, when they move around the outside some fall into the players bin while others fall back to the house. that $50 will never fall.
https://youtu.be/gtKrsQMd1MY?si=Z3Y5jGmShm6jT-rs