Arbitration
An opt-out clause in the agreement only speaks to the threshold question of scope of arbitration, and does not forestall an exemption from compulsory arbitration in order to effectively vindicate a claim.
Giver internal inconsistencies in the agreement and incorporated rules, a plaintiff might justifiably refrain from pursuing a claim, given the uncertainty of eventual reimbursement.
https://www.ca10.uscourts.gov/opinions/14/14-1502.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.