I’m really confused on how this would work. Making coffee is a very ‘analog’ process. They could copyright the software that they use to determine how much water to pour. Are they going to add a smart chip to their cups? I don’t see this being cost effective.
They should probably not be selling empty cups that you can use your own coffee with either.
It’s probably more of a lawsuit-as-business-model (contra manufacturers) than about going after individuals who make coffee. You really can’t interfere with my ability to use non-connected devices in my home (or devices I can disconnect), but if a company can sue their competitors out of existence then they would have no competitors, and can twirl their mustaches and rake in the profits.