Example of static-class locator anti-pattern

Services.cs

public static class Services
{
  public static AdService ads { get; set; }
  public static APIService api { get; set; }
  // tons of other services
  public static AnalyticsService analytics { get; set; }
}

public class Loader : MonoBehaviour {
  private void Awake()
  {
    Services.api = new APIService();
    Services.api.Login(); // Services.api.UserId is available only after login operation succeeds
    StartCoroutine(InitAnalytics());
    // if anybody calls Services.analytics
    // before it's initialized, you get NRE exception
  }
  
  private IEnumerator InitAnalytics()
  {
    while (!Services.api.isAuthorized) {
      yield return null;
    }
    Services.analytics = new AnalyticsService(Services.api.UserId);
  }

}