Event sourcing and CQRS are very useful patterns for backend development of gaming applications.
Solve regulatory requirements
Low latency writes and highly scalable reads
Track user behaviour
Audit trail
Most gaming applications have high compliance requirements. Event sourcing gives your application an audit trail out of the box, making it easier to meet regulatory requirements.
User tracking
Designing your application around events and processes shortens the feedback loop to your business experts. You will always know what your users are doing and how it affects your system.
Horizontal scalability
Leverage the fact that writing to the event sequence is really fast. Meanwhile, updating statistics and player data can be asynchronous within some limitations which makes this a very scalable architecture for gaming applications.