I checked Rules / Scoring.

While rare, and perhaps unprecedent. It is very possible that there is a Tie. Especially on the 2 game nights, where two people might have a different 0pt player on their team, and rest same players.

Another way of asking the question is if there is no winner, is fee refunded? otherwise would seem like getting a 0 or 00 on the roulette table

On a tie the prize is split between the two players. That is net of commission. Unfortunately we have to do that for legal reasons. Thankfully ties are very rare in NBA and in NFL now we have fractional scoring.