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.
This is also the origin of the early eighteenth century verb to doodle, meaning to swindle or to make a fool of. The modern meaning emerged in the 1930s either from this meaning or from the verb to dawdle, which since the seventeenth century has had the meaning of wasting time or being lazy.