Navy_King
The reason that I give you power stones over other authors is because of consistency updating, the plot and your chapters are free to read.
An example would be 'Unfortunate Hero's Retirement Life' by HotIce, it starts locking chapters at chapters 75-80, I don't know exactly when as I have them unlocked after spending some coins etc, Have you not read books where chapters are locked? Because there are plenty on this site.
Ashmodai:Could you name an example. I have Fanfics on a different account with over 200 chapters and there doesn't seem to be a option to lock chapters.