Although I use safety wire (and 0.043 at that) I can't imagine that any of my spinners could ever come off on their own.
Once or twice a year I take my wheels off to clean them. Without fail I have to hit each ear many many times before the spinner is loose. What makes it even more amazing is that I do not go crazy when I put them on. These things are worse than both
oil filters and 2 liter soda bottle caps for welding themselves on.
Bob