I always forget to check if Unity's splashscreen is activated, so here is a Pre-Process Build to check if i'm using Unity Plus/Pro and deactivate it for me.

AutoHideSplashScreen.cs

#if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using UnityEditor.Build;

#if UNITY_2017
class AutoHideSplashScreen : IPreprocessBuild
{
	public int callbackOrder { get { return 0; } }
	public void OnPreprocessBuild(BuildTarget target, string path) {
		// Do the preprocessing here
		if (Application.HasProLicense()) {
			Debug.Log("UNITY IS PRO!\n Deactivating SplashScreen");
			PlayerSettings.SplashScreen.show = false;
			PlayerSettings.SplashScreen.showUnityLogo = false;
		} else 
			Debug.Log("Unity is not pro :(");
	}
}
	#endif

	#if UNITY_2018
using UnityEditor.Build.Reporting;


class AutoHideSplashScreen : IPreprocessBuildWithReport
{
	public int callbackOrder { get { return 0; } }
	public void OnPreprocessBuild(BuildReport report) {
		
		if (Application.HasProLicense()) {
			Debug.Log("UNITY IS PRO!\n Deactivating SplashScreen");
			PlayerSettings.SplashScreen.show = false;
			PlayerSettings.SplashScreen.showUnityLogo = false;
		} else 
			Debug.Log("Unity is not pro :(");
	}
}
	#endif
#endif