Why can’t a static member function have a cv-qualifier? [duplicate]

Worth quoting the standard here

9.4.1 Static member functions

2) [ Note: A static member function does not have a this pointer (9.3.2). —end note ] A static member
function shall not be virtual. There shall not be a static and a non-static member function with the
same name and the same parameter types (13.1).

A static member function shall not be declared const,
volatile, or const volatile.

static functions have no this parameter. They need no cv-qualifiers.

See this answer by James McNellis

When you apply the const qualifier to a nonstatic member function,
it affects the this pointer. For a const-qualified member function
of class C, the this pointer is of type C const*, whereas for a
member function that is not const-qualified, the this pointer is of
type C*.