I have played only demon souls which I did stop after the second world because I could not understand how to approach a soulslike. But I completed it later after reading a few guides. Also I don't have experience of playing a 2nd soulslike so I cant say why would one stop playing but my best guess would be that when one understands the flow of the game he may choose to not continue with it.
Already happened in India by Modiji
You can play on harder difficulties