Will companies now save more money on toner?

Is there anyone selling a reverse-engineered, refillable pod for the coffee machines that only accept pre-filled proprietary ones?

Do these coffee machine vendors seek to use patents to protect their sales of coffee?

Edit: I know Keurig and Nespresso are the well-publicised examples, but I was thinking of the others. I assume with reasonable confidence there are others still using non-refillable proprietary pods.