For the RMN shutdowns, at first glance I'm thinking it's less the gift card purchases and more using 2 accounts at the same time. Even though they're for separate people it probably looks like it's the same person who made multiple accounts given the transaction history and especially if both are linked to the same paypal account. That's my theory until we hear of single accounts getting shutdown too. (unless I missed one?)
Could maybe try to prove you are two people who just happen to shop together (and I do know some people who still share a smartphone, although they're in the extreme minority now). I didn't think it said anything about one per household, but I could have missed it since I only planned to use one account anyway.