@Paracelsus your said user setting is implemented and the plugin is updated, through which a user can refuse to change its notification level by the plugin
The setting is provided at /preferences/profile
section named as Allow site to change your notification level of frequently visited categories
and Allow site to change your notification level of frequently visited tags
As per the discussion response, I will change the category setting to preferences/categories
location and tag setting to preferences/tags
location.