When I had cats, they would poop on the floor and try to "cover" it up. But in most cases, there would be nothing to cover it up, so they just sweep the floor.
Sometimes, my cats would cover up their poop or vomit with anything they would find on the floor. rip if someone left their clothes on the floor.
It's instinct for cats for cover up their poop, even if there's nothing to use to cover.
When I used to go camping, there were some campsites where the toilets were outdoors. Like, there were stalls, a floor and a ceiling, but there was a gap between the stall walls and the ceiling so you could feel the breeze (and also the bugs).
The only time I've even squatted to use the restroom was when I camped on an island in the Everglades when I was 12. I had to dig a hole then fill the hole back up after I finished doing my business.