Has Discover been known to shut down accounts? And what would the main trigger(s) be for shutting accounts down?
I think so, but I can't recall. You could text search this thread for shut down, but you'll probably get lots of hits.
I've been trying to do my own research on shut downs, and encouraged people to post data points here to look for patterns. Not a whole lot of progress made on that front, but it seems to me the following are likely:
1. Using companies other than Old Company and New Company. This has multiple impacts:
---> A. Other companies have lower quality risk controls; they may ask you to add people who are problematic.
---> B. Other companies may not be as likely or capable of detecting shut down audits by the CC companies, or communicating those out if/when they happen.
2. High # of AUs on the account at the same time.
3. High # of lifetime AUs.
4. AUs on for a short period of time.
5. AUs who are not family members.
6. Not following the TL company guidelines, such as adding/removing in the same phone call.
There could be others, but those are the ones that come to mind easily. Even if you avoid or minimize all of these shut down risks, there is probably always a non-zero risk of shut down, and you should only play this game with cards that you're willing to get shut down.
Personally I only work with Old Company and I follow nearly all of their recommendations. I don't particularly try to mask my AU behavior with the card companies. I have numerous cards where there is a single $2.50 charge to Amazon.com monthly and have had a dozen or so AUs lifetime, all of whom are not family members and none of whom live with me. So if they catch me, I'll shrug and move on to something else.