Final answer:
Wordscapes uses the freemium pricing model, where the app is free to download but generates revenue through in-app purchases for additional features or resources.
Step-by-step explanation:
Treena's experience with the Wordscapes app involves a common app pricing model in today's digital marketplace. While she downloaded the Wordscapes app for free, she encounters the opportunity to make in-app purchases for additional coins, which can be used to solve puzzles.
This pricing model is known as freemium, a portmanteau of "free" and "premium". Free apps using the freemium model are available to users at no immediate cost. The revenue is generated through in-app purchases that enhance the user experience, provide additional features, or advance progression within the app.
The freemium model is particularly popular in mobile gaming, where players can download and play a game for free but may pay for additional in-game resources or to unlock special features.