When the new Apple TV launched with the ability to play apps and games, Apple made it a requirement for games for the platform to support the Siri Remote.
Now it looks like Apple has changed their mind and it is no longer a requirement for Apple TV games that they support the Siri Remote.
Apple has now changed their requirements and recommends that developers support the Siri Remote but it is no longer a requirement, you can see the change listed below.
When designing a tvOS game, you may require the use of an MFi game controller, but where possible you should also support the Siri Remote.
This means that we may see some improved games on Apple’s TV platform as some developers may have been put off developing for the platform when the Siri Remote was a requirement as a controller.
Source The Verge