Why use the Share operator in RxJS?

Question

Here is an example known from Sphere RxJS, why use the ***Share*** operator?
```ts
 const example$ = timer(1000).pipe(
tap(() => console.log("side effect is called")),
map(() => "Result is mapped"),
share());

const firstSub = this.example$.subscribe();
const secondSub = this.example$.subscribe();
```

Accepted Answer

To avoid that the subject logic is called several times

Accepted Answer

To transform a unicast observable into a multicast observable

Answer

To share the observable and be able to call unsubscribe only once for both subs

Answer

To avoid memory leaks

Question from the Introduction to RxJS test

Why use the Share operator in RxJS?