std::move on a const Object Still Copies

1#include <iostream>
2#include <utility>
3using namespace std;
4 
5class Tag {
6public:
7    Tag() { cout << "default" << endl; }
8    Tag(const Tag& other) { cout << "copy" << endl; }
9    Tag(Tag&& other) noexcept { cout << "move" << endl; }
10};
11 
12int main() {
13    const Tag a;
14    Tag b = std::move(a);
15    Tag c;
16    Tag d = std::move(c);
17    const Tag& ref = d;
18    Tag e = std::move(ref);
19    return 0;
20}