I may make some people mad with this post.

K-cups, or Keurig Pods, have a huge downside. Over 10 billion pods are used
every year and they have a significant negative impact on the environment.
https://www.homegrounds.co/ca/k-cup-environmental-impact/

There are alternatives, of course. The Moka Pot was invented in 1933, and when
using it, only the coffee grounds are thrown away - into the compost, of course.
And Moka Pots make pretty good coffee.
https://en.wikipedia.org/wiki/Moka_pot