What happen with old objects after using spread operator?

Question

When we use spread operator, then the new obj will be created. So what happens with old objects, if we press button many times?

 const [name, setName] = useState({ first: "Name", last: 0 });
  const [count, setCount] = useState(0);
  const increment = () => {
    setCount(count + 1);
    setName({ ...name, last: count });
  };
  return (
    <div>
      <p>
        Counter = {count}
        <button onClick={increment}>Set last name</button>
      </p>
      <p>
        {name.first} {name.last}
      </p>
    </div>
  );
}