This policy being so specific in what it bans means that you can't enforce it easily against people who are close but technically within the letter of the policy, and you create a grey area and friction for those who are meeting the spirit of the policy in good faith, but technically in violation.

I have friends and colleagues who I trust as good engineers who take different positions on this (letter vs spirit) and I think there are good faith contributions negatively impacted by both sides of this.