Ok. All good. Here's what happened.
I logged in for the first time in about a year. I found that my balance was 0, when it should have been a lot more. I talked to CS agent "Warner". I told him my balance was supposed to be X but it showed as zero. Warner told me 0 was the correct balance and I was free to look at my transaction log.
I looked at my transaction log. There were a bunch of wagers which looked like the wagers that I had made, but the balance figures were inaccurate. Multiple places in the transaction history said my balance was negative when I placed bets. I had a $5k payout last year, but the transaction log said I had a negative balance when I took the payout.
I asked Warner why
DSI would have paid me $5k if I had a negative balance. He said DSI made a mistake and paid me when it shouldn't have, and that the system let me bet many times with a negative balance due to a "system error". I asked for a manager and Warner told me that Christian Madriz (manager) would be available soon.
Then Madriz contacted me and told me the system zeroed out my balance due to inactivity. Everything is good now.
I'm not going to opine on whether this was an attempt to confiscate my balance. For those who are playing with or want to play with DSI, note that Madriz told me that he can disable a feature that zeroes out a balance due to inactivity and did so for my account so that this couldn't happen again.