True, I wrote something similiar in the conclusion section. However, you can easily imagine a scenario when you need to perform some complex validation that can

True, I wrote something similiar in the conclusion section. However, you can easily imagine a scenario when you need to perform some complex validation that cannot be handled by Firebase rules but it doesn't justify having to maintain a server. The implementation in the tutorial is just an example - I wanted to provide a starting point for people who want to do something more complex.