Unity Ads generates revenue by displaying paid advertisements in your game. The more traffic and impressions) your game creates, the more money you can earn.
Unity Ads facilitates different campaign types with different billing points (for example, completed views, clicks, or installs), and always selects the highest-earning campaign to display to your users.
The average eCPM for Unity Ads depends on many factors, such as platform, region, player demographics, and in-game placements. The biggest factor is the number of players engaging in your game.