"Gatcha", from Japanese "gatchapon"; there's little dispenser machines which sell plastic eggs containing a random collectible from a set. There are thousands of different product lines.
Basically game lootboxes, but IRL. People like gambling, it seems.
Protip: If you call it an investment, it becomes not only respectable but it is in fact the responsible thing to do for your customer's financial security.
Labubus just happened to get a wide appeal and had a moment in the US for some reason..