In what cases is it recommended to use service objects in application architecture?

Service Objects are used to extract business logic from controllers or other components to make the code more modular, readable, and testable. It is recommended to use service objects in the following cases:

• When the operation logic is too complex and inappropriate for controllers or ViewModels.
• For reusing business logic in different parts of the application.
• To separate responsibilities and follow the Single Responsibility Principle (SRP).
• To simplify testing, as service objects can be easily tested separately.

For example, in Android, you can create a class responsible for handling payments or data loading, separating this logic from UI components.