Article: "you can [...] add detergents manually [...] however they strongly suggest against this", so I can't see how anybody is forced to buy the cartridges. A

Article: "you can [...] add detergents manually [...] however they strongly suggest against this", so I can't see how anybody is forced to buy the cartridges. Also, they did obviously not put any work in making their "DRM" secure. At the most, they're hoping that people would buy the expensive new cartridges, because it's more convenient than manually adding the detergent. It's a grey zone at best.