Still I believe most cases can be covered by simple categorized rules. Like in your case - Using VPNs or artifically forcing packet loss is forbidden.
I don't think fair judgements can be consistently made if we have a wildcard-rule that fits all situations and that concerns me event though I always aim to play fair.
I also see your point that cheaters can always find loopholes in the rules they can exploit and it's easier to create a general rule about good conduct. It's a decision to be made. I would start by analyzing how many players aim for deliberately evading rules. If too many it's better to create a general rule. If only a few - it's better to respect the well-behaving portion of the playerbase with clear rules.
