It's also not hard to make like an algorithm (probably pretty forgiving) where they take your rifts, grifts, bounties, etc and come up with a range. If you are significantly outside that bloodshard range, obviously you exploited. There aren't really a lot of ways to gain bloodshards, so if you range should be 130k - 180k for this season and you have like 500k....it's pretty easy to see you exploited.