If you only use offline tiles, you do not need to use the cache.
It's just too much.

If you use online + offline tiles, you need to use this way:

private void Start()
{
    map = OnlineMaps.instance;

    if (OnlineMapsCache.instance != null) OnlineMapsCache.instance.OnStartDownloadTile += OnStartDownloadTile;
    else map.OnStartDownloadTile += OnStartDownloadTile;
}

In this case only online tiles will be cached.
Tiles loaded from your scripts will not be duplicated in the cache.

I use the event hook you supply for feeding offline maptiles in your system ( OnStartDownloadTile(OnlineMapsTile tile)), there I retrieve offline map tiles out of a mbtiles file.
My question now is the caching compenent, is it useful or is it bypassed by this hook. So does it store the tiles in a cache regardless of where they come. I guess so, I just wanted to make sure not to bloat my app without using the feature...
best,Robert