So Sportsbet is now a partner of Watford FC and is starting to build its reputation with an aggressive marketing. I kind of like this but IMO they still really need to pay its long overdue 6.5 BTC on one of its client winnings.

Most likely you had visited trust page of sportsbet.io, the case you have mentioned it has been solved already. Unfortunately both DT is inactive those have left negative feedback's. Zepher is no more ( Hope he is fine in haven), and Lutpin was inactive from long time. So I would like to say just avoid both negative feedback's.
sportsbet.io have 0 unsolved disputes or discrepancies. Its 100% safe to gamble with them, I have been myself for years.