Some months back, I made a joke statement on a tf.tv post

Just another reason why F/OSS games are superior to closed-source proprietary games.

Some users then argued with me that making anticheat systems FOSS would cause more problems. I conditionally disagreed with them at the time.

Today, I visited that posted again and I laughed at the past chaos; but now I am curious: Should anticheat systems be F/OSS?