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The maximum message size is enforced by the server when it receives a message from the client. If a client attempts to send a message larger than the maximum size, the server will reject the message and return an error to the client.

However, if the server receives a message larger than the maximum size, it may still process the message if it is able to read and process the message in chunks. This can lead to unexpected behavior and potential security vulnerabilities, which is why it is important to enforce the maximum message size on both the client and server side.

Therefore, if the maximum message size is not being increased in Grpc despite receiving messages larger than the maximum size, it could be due to a misconfiguration in the server or client code, or a bug in the Grpc implementation. To fix the issue, the maximum message size should be increased and properly enforced on both the client and server side.