Is it necessary to unsubscribe from a combineLatest within a forkJoin?

According to the RXJS documentation itself, from what I understood, the forkJoin, when finishing all the calls, it gives completed(), which automatically unsubscribes, with this it is not necessary to manually unsubscribe. But what if I have a combineLatest that is signing something, like this: forkJoin({ xSubject: this.serviceX.on(), ySubject: this.serviceY.on(), zSubject: this.serviceZ.on(), wSubject: this.serviceW.on() }) .pipe( switchMap(({ xSubject, ySubject, zSubject, wSubject }) => { return combineLatest([xSubject, ySubject, zSubject, wSubject]); }) ) .subscribe(([x, y, z, w]) => { console.log(x) console.log(y) console.log(z) console.log(w) }); Is it necessary to unsubscribe from it? What is the best way in this case, if necessary?