UPDATE

On November 12, US District Court of Nevada granted Skillz's motion to compel arbitration. The court had previously granted Skillz's previous motion to compel "Jane Roe" (third plaintiff -- the one who was the losing player) to use her real name in the suit. However, this becomes moot because the whole thing
is being forced back to arbitration.

The judge wrote this:

Because (1) the plaintiffs agreed to the Terms of Service by creating accounts in Skillz’s app and (2) the arbitration agreement in the Terms of Service is valid and enforceable, I grant Skillz’s motion to compel arbitration.
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.
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IT IS THEREFORE ORDERED that defendant Skillz’s motion to compel arbitration [ECF No. 22] is GRANTED and this action is DISMISSED without prejudice to the plaintiffs’ ability to arbitrate their claims in compliance with the arbitration agreement, minus the agreement’s fee-splitting provision.

Mac is apparently appealing this.