“Charlie- that hasn’t happened. “
It happened in Ontario, Canada.
“The fact remains, private parties can contract to arbitrate their disputes however they want.”
And the results from such arbitration are not enforceable in court. If one party doesn’t like the result, he/she can walk away.
It is worth noting that in Medinat Yisrael, sharia courts operate, are binding for Muslims on personal status matters including marriage and divorce, and are paid by the Israeli government.