I've heard from pilots at a couple of different regionals about the perception that a "franchise tag" was sometimes employed. The "franchise tag" was persnickety or gratuitous failures handed out on training events that might act as an obstacle or deterrent for a pilot to try and go somewhere else down the road. At a regional with a flow, that would seem like a way of not having other airlines raid their training pipeline. Not having seen it personally, I can't speak to it, but there are certainly rumblings out there that it goes on.