I do love all animals robomatic, but with regard to rabbits, many of the poor things end up in rather small hutches, left outside in the cold, and once the children are bored with them, there they sit.

When one observes rabbits in the wild, they live in colonies, in extensive warrens connected by tunnels, and run all over the fields, so life alone in a hutch is cruel and unnatural.

Some folk here let their rabbit run freely around the house, but I don't know if they can be trained to use a litter tray (I reckon not)

I'm a bit doubtful about children and small, delicate pets like guinea pigs, hamsters, rabbits and so on. They need gentle handling and children can be a bit rough at times.
There's a massive rabbit show at the Royal Norfolk Show every year, and some of the breeds are huge (Flemish giant for example) It can be quite an interesting hobby, if the animals' needs are met correctly.