So my old account got unbanned (Trading Pass enabled). I have no clue why. Just noticed a few days ago.
It was chain banned for trading with a scam artist (who wasn't me). I guess they determined I was an innocent bystander, about a year after they disabled my TP.
All in all, I don't really care that much. There was only about a mil worth of items on that account, and it's not worth risking the fact that they may be snooping around on it to see if they can link it to any other accounts that I interact with, so I'ma just leave it be, I guess.

Anyone who has had their TP disabled (other than people who actually deserved it by scamming), there's hope. Just wait a year.