These are the 'benevolent authoritarian-ship' outliers - very rare and depends on chance that the current person in power truly acts in the interest of the public - but when they are gone there's no legal framework in place that keeps their successors to do whatever they please.
EDIT: commenters are still all referring to Singapore which I remind you is the very rare outlier case.
EDIT: commenters are still all referring to Singapore which I remind you is the very rare outlier case.