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I must admit I only skimmed through the thread so feel free to report me for shitposting if this has been already addressed... but those asking for proof from Sportsbet - what exactly are you expecting? Short of doxing the OP (or even then) I don't see how they can definitively prove that the OP is multiaccounting, particularly if we don't trust them and assume that proof can be fabricated.
For the record, I don't like "no multiple accounts" rules, I think such rules can't be fairly enforced leaving all sorts of loopholes, and there are often good reasons to have multiple accounts. Having said that, if you sign up for a service that has such rules you probably don't have much of a case if you get caught.
The other thing I have some concerns about is the amount of 0.373 BTC. Does that include the 0.1 BTC (IIRC) that Sportsbet offered to pay out?