Earlier quoted context omitted.
> From my perspective Instacart is stealing from its customers and workers by doing this. This is 100% wage theft.
It will not matter. Washington state law does not apply. The sovereign state of Washington laws are superseded and invalidated by mandatory binding arbitration. The rights set out in the State of Washington's constitution do not apply, for they are superceded and ignored by mandatory binding arbitration. Any dispute will go to a monkey court instead.
No, they aren't; binding arbitration is a venue for resolving disputes about the application of laws, it doesn't supersede the laws, and manifest disregard for the law is one of the few reasons for courts setting aside a binding arbitration decision.