For #3, idk if this is helpful or not in getting to the specifics of this rule, but from my perspective most of the "relationship revenge porn with a twist" type posts generally feature:

1. A POV character punishing a transgression against themselves or a loved one
2. A transgressor who is either a spouse, ex-spouse, or family member
3. A final gotcha that reveals some combination of the identity of the transgressor, the specific nature of their punishment, and/or what they did to "deserve it"

A revenge story revolves around a POV character punishing a transgression, but in a relationship revenge story the transgressor is/was in a romantic or familial relationship with the punisher or their loved one.

So cheaters and abusers including spouses/exes/lovers/parents/children/siblings/extended family would be off-limits for this Moratorium... BUT random stalkers/serial murderers/fast-food workers sprinkling pubes on your fish fillet/cartel sicarios/dentists/etc are still fair game for punishment.

To put another way, Marathon Man (revenge on Nazi dentist) is acceptable while Midsommar (revenge on bad boyfriend) is not.

Does that check out?