Without the disclosure of the above information, the OP having multiple accounts does not matter, and I would view the situation as SB using a technalicity to arbitrarily confescate user winnings, and as such, SB would be a high risk to trade with.
I reviewed SB's trust page and found this:
Timeline of events
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30.03.2017 – The Client was immediately flagged for suspicious gameplay due rapidly changing gameplay dependant on whether the transaction was confirmed in the blockchain or not.
30.03.2017- 02.04.2017 – The Client continues the suspicious gameplay over the course of 4 deposit/withdraw instances.
02.04.2017 – The Client requested a withdrawal in the sum of 20.6 BTC which was declined by the Operator due to suspicious gameplay.
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Red trust is for users who are high-risk in trading. Someone continuing to escalate a dispute after binding mediation - high-risk shithead IMO.
If someone offers to mediate a dispute, and the mediation is unable to offer an explanation that is satisfactory to observers, there is no reason why an observer should be obligated to accept the outcome of said mediation. This is even true for the OP, unless he has explicitly agreed the outcome of the mediation is binding, which I have not seen evidence of. It is not uncommon for parties involved in a dispute to engage in non-binding mediation to try to resolve disputes; sometimes it is successful, but oftentimes it is not.