Weird implementation of Singleton for ScriptableObjects

SingletonScriptableObject.cs

using UnityEngine;

namespace JamesFrowen.Variables
{
    public abstract class SingletonScriptableObject<T> : ScriptableObject where T : ScriptableObject
    {
        protected static T _instance;
        public static T Instance
        {
            get
            {
                if (_instance == null)
                {
                    _instance = FindObjectOfType<T>();
                    if (_instance ==null)
                    {
                        _instance = CreateInstance<T>();
                    }
                }
                return _instance;
            }
            protected set
            {
                if (_instance !=null) { Debug.LogWarning("overriding singleton instance"); }
                _instance = value;
            }
        }

        protected virtual void OnEnable()
        {
            if (_instance == null)
            {
                _instance = (T)(ScriptableObject)this;
            }
            else if (_instance != this)
            {
                Destroy(this);
            }
        }
    }
}