It's pretty easy to litter train a bunny. They do intentionally leave territorial poops anyway, but those are hard little balls at the edges and corners of the room, so not too obnoxious.

The most difficult thing about a free roaming bunny is that the like to chew (it's more correct to say they have to chew, since their teeth always grow), and getting them to chew what you want them to chew, not what you don't want, is a challenge.

All my buns are free-roam and potty-trained! Sure there might be some stray poops sometimes, especially when something startles them, but I'd say they're great 97% of the time. Spaying/neutering them helps a lot.

When I find a lot of poop outside their litter box (most of the time in one neat stack), it usually means they're angry at me. Food is late, litter box is too dirty, there is too much noise outside (somehow this is my fault)... haha.

Unsurprisingly the type of people would let a bunny freely roam and shit in their house are the same type of people who would spend a stupid amount of money to doordash junk food to their house.