4. Freemium With Credit. Many awesome online products allow users to choose from a free version, which includes a watermark or credit line, or the option to upgrade to the paid version, which allows users to remove the mark or replace it with their own logo.
Definition of at the whim of (someone) : when (someone) wishes, desires, or decides something often in a sudden way The shop is only open at the whim of the owner.
The definition of utility is something that is practical or has many uses. An example of utility is a mulit-function pocket knife. Utility is defined as something that is useful to someone or to the general public. An example of utility is the gas and electric company.