Explanation
The value delivered by a product can not be determined by revenue alone, because:
Revenue is only one aspect of value, and it may not reflect the true impact or benefit of the product for the stakeholders, the users, and the society. For example, a product may generate high revenue, but also cause environmental damage, ethical issues, or customer dissatisfaction.
Value is a subjective and relative concept, and it may vary depending on the context, the perspective, and the criteria of the evaluation. For example, a product may have different value for different segments of customers, or for different markets or regions.
Value is dynamic and emergent, and it may change over time due to various factors, such as feedback, competition, innovation, or regulation. For example, a product may lose its value as new alternatives or solutions become available, or as customer needs or preferences evolve.
References:
Scrum Guide 2020, page 6: "The Product Owner is accountable for maximizing the value of the product resulting from the work of the Scrum Team." Scrum Guide 2020, page 11: "The Product Goal describes a future state of the product which can serve as a target for the Scrum Team to plan against." Scrum Guide 2020, page 11: "The Product Owner is accountable for effective Product Backlog management, which includes ... optimizing the value of the work the Scrum Team performs."