Ferrets are not completely domesticated, and are indeed classified as exotic. It’s extremely difficult to insure them (in many plaves impossible), it’s primarily exotic specialized vets that can help with them, and though they are extremely friendly and fun, they are at best “half” domesticated. They are also banned in many countries and states.

Source: I have four ferrets and love them, but I also know exactly how putting your hand near a young ferret plays out every single time, and it takes months of training to get them to stop wanting to draw blood <3