Quick summary
How does a consumer file a demand for arbitration to AAA, when the fee is covered by the business?
Context
Some terms of use for business services impose to the consumer the use of arbitration instead of courts, yet the business pays the fees for arbitration. This is the case for example with Uber (https://www.uber.com/legal/terms/us/):
Your responsibility to pay any AAA filing, administrative and arbitrator fees will be solely as set forth in the AAA Rules. However, if your claim for damages does not exceed $75,000, Uber will pay all such fees, unless the Arbitrator finds that either the substance of your claim or the relief sought in your Demand for Arbitration was frivolous or was brought for an improper purpose
A Consumer Demand for Arbitration Form can be obtained from AAA: Consumer Demand for Arbitration Form. The manual states that:
The filing fee must be paid before a matter is considered properly filed . If the court order directs that a specific party is responsible for the filing fee, it is the responsibility of the filing party either to make such payment to the AAA and seek reimbursement as directed in the court order or to make other such arrangements so that the filing fee is submitted to the AAA with the Demand.
The question
What does this mean in practice, it seems there are two options? Does it mean the consumer should pay the fee, and will somehow be reimbursed at some point? Or does the consumer has the choice to go for the second option (cf either), and ask the business to pay directly the fee? Finally, what is a frivolous claim or relief? Could a dispute over a small amount be considered frivolous?