Instacart’s independent contractor agreement includes an arbitration provision that names JAMS. There is a 30-day opt out. It is unclear how Instacart treats those independent contractors that opt out.
https://shoppers.instacart.com/contracts/2017
Instacart - Independent Contractor Agreement.pdf (176.2 KB)
It is interesting to me that it names the JAMS Employment rules but surely would argue that independent contractors are not employees. That may be a meaningless distinction but still would be interesting to explore in the future.