Zenefits isn't relying on goodwill -- they're actually a subcontractor of the customer of ADP, so ADP is actually blocking their own (paying) customers. ADP is

Zenefits isn't relying on goodwill -- they're actually a subcontractor of the customer of ADP, so ADP is actually blocking their own (paying) customers. ADP is saying that they'll delete the logins of customers who use a particular subcontracting firm, because they don't want their customers to use that firm's services. I think you don't quite understand what the situation is here.