Funny

They can be to an extent. My girl raisin does better she is spayed but her husbun/son felix is intersex and still has his cashews so he still sprays(mostly our cat) and leaves territorial droppings around. But bunny droppngs arent gross like cat/dog / human feces. They are just compressed balls of digested hay and veggies and are mostly dry. A little moist when fresh but after a day they are dried out. If i had felix fixed he would likely not spray our cat and leave droppings in places other than the box. But they do tend to leave droppings where they sleep/nap even if they are fixed so you'll have a nice pile of 100 or so cocoa puffs to pick up when they are done napping. I just am afraid to have felix fixed since he might need invasive surgery if he has any internal female sex organs and he has such an interesting personality i dont want him to loose his spunky attitude after surgery or even worse, its not uncommon for rabbits to have adverse reactions to anesthetics and not make it through surgery. But spaying female rabbits is different since they have a very high 90%+ chance of reproductive organ cancer in old age.

So its a bit more complex than training a cat to use a litterbox. Its probably a little more difficult than even training a cat to use a human toilet with one of those toilet insert training liter boxes you can get.