Donating for a free app is often a way for users to support the developers who have put time, effort, and resources into creating and maintaining the app. While the app itself may be free to download and use, developing and maintaining it typically incur costs, such as server fees, software licenses, and developer time. Donations help offset these costs and can also serve as a way for users to show appreciation for the work that developers have put into creating something useful or enjoyable.