You might want to relocate the litter box or add another.
Cats value their privacy. Litterbox is in the bathroom and I keep the light off. Never had issues
The rule for litter boxes is N+1 where N = number of cats.
Never had a problem when following this rule, except when one kitty got a bladder infection.
A quick google followed by clicking on the first link and uncritically reading the first sentence tells me there’s over 1 billion cats in the world. I don’t think I can afford that many litter boxes
We have 4 cats with 4 boxes and they do just fine
That said… 4 cats is too many and I don’t recommend anyone get this many unless you are a cat sanctuary
We have 3 and same. 2 per household is enough, don’t get more than 2
Me who just got a 3rd 😬
Fwiw, I love all of them and I don’t regret having 3. But I’ll never have 3 cats at the same time again lol
We have 4 and two litterboxes. No issues with them doing their thing. I have had it recommended we need more litterboxes, but since there are no issues, I don’t really see the point. That being said, we religiously clean those twice a day, so I suppose that helps. And on the point of 4 cats, I agree, it’s a bit much. We had two and then last year we found two kittens on the street (not at the same time), one scroungy as hell and the other one had a gaping wound. We nursed both back to health and then didn’t have the heart to give them away, so yea, that’s how that went.