no you can already be in twinspires nothing to do with signing up. looks like it was just some love the sport, notice more late Australia racing and giving some free money for anyone paying attention, no stipulations
Terms & Conditions:
Opt in now
Place a win bet on #5 Winx - Race 6 at Randwick (Australia B)
If she wins, we are paying out at 2-1 odds!
Additional Terms:
Offer is valid for a single Win bet on #5 Winx - Race 6, The Apollo Stakes at Randwick Racecourse (Australia B). You must opt-in to be eligible for payment. If Winx wins the race and her final odds are lower than 2-1 than TwinSpires will make up the difference. For example: if her odds are 2/5 when the race goes off, the return would be $2.80 for a $2 bet. TwinSpires will pay a bonus of $3.20 on that $2 wager to return 2-1 odds, which would have paid $6.00. This offer is valid for up to a $10 Win wager on Winx. In the event that Winx is not the winner, there is no bonus payout. Certain exclusions apply.