is there a way to ban .asObservable() method

[goldenratio]

Hey,
wondering, is there a way to ban .asObservable() method? Thanks.

// wrong
get click$(): Observable<void> {
  return this._clickSubject$.asObservable();
}

// correct
get click$(): Observable<void> {
  return this._clickSubject$;
}

[mhombach]

I think, as long as there is not a fixed rule, you could use the restricted-syntax rule to define that rule yourself in your lint config.
But could you explain in which cases asObservable() might be a problem?