See, it's not a union. Unions are apparently uncool in the USA. Think of it as Musk inventing the Tube by removing the engineeringly silly parts of the Hyperloop and adding a sharing economy feature to the result :)

Why would you share your "not-union" membership with your employer? Instead, use it as a coordinator between your peers to prevent being underpaid and overworked do to information disparity you normally have in your relationship with you employer and if you get screwed it turns out you have access to lawyers.

Something of that sort.