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.
seduce - lure or entice away from duty, principles, or proper conduct; She was seduced by the temptation of easy money and started to work in a massage parlor. entice, lure, tempt - provoke someone to do something through (often false or exaggerated) promises or persuasion; He lured me into temptation.