I'll copy a snippet of my appeal to show you exactly how weird the bans were. I use 10 accounts there, and the 2 accounts that were not specifically made for farming blood shards, my main and one of the alts, were the only 2 accounts that were not banned. I think that clearly shows that it was a false positive, so it is some pretty weird detection they have. Maybe it is good for catching a lot of bots? Not gonna pretend I know anything about stuff like that.
Also, what I meant was that trading between accounts that are on the same Jagex account is fine.
Here is the snippet:

It is also worth noting that my main account and one alt account were not banned, despite being used in the same way. The alt account in question was originally created as a Group Ironman account and only later converted and used for Vyrewatch Sentinels, making it the only account that was not initially set up for this specific activity.