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In Unity, a GameObject can indeed have more than one collider attached to it. This allows developers to create complex interactions and shapes for physical simulation. For instance, you could have both a box collider and a sphere collider on the same GameObject to accommodate a combined shape that requires both types of collision detection.

Colliders are components that define the shape of a GameObject for the purposes of physical collision detection, and having multiple colliders can be beneficial for achieving more accurate and varied interactions within your game. However, it's important to note that if a Rigidbody component is attached to the GameObject, typically only one collider is actively used for collision detection, as Unity will use that single collider to manage physics interactions efficiently.

Thus, the notion that GameObjects can only have one collider applied to them is not accurate, as multiple colliders can co-exist on the same GameObject to enrich the game mechanics.