Whenever I think about this topic, my gut says that a service provider's moral obligation to refuse service to customer relates linearly with the customer's rel

Whenever I think about this topic, my gut says that a service provider's moral obligation to refuse service to customer relates linearly with the customer's reliance on the service in conducting its morally odious behavior. In other words, I see McDonalds selling cheeseburgers to ICE differently than I see a physical security company selling cages to them. Is this defensible? From a utilitarian standpoint there's an argument that your refusal of service has greater moral impact as the customer becomes more reliant on it. Practically speaking there's the argument about efficiency. A lot of people need cheeseburgers and so the list of companies you have an issue with is going to be pretty damned large. But other than that is there a philosophical basis for this way of thinking?