1. Successful examples of companies firing the customers are like Airbnb which asks for feedback about customers from hotels and may put them in " no serve" category in extreme cases or not allowing them to write feedback where the customer was found to by unruly, bullying and rude. The company thus keeps itself clear from such customers.
2. Unsuccessful example of firing the customers is by Sprint Nextel that discontinued many wireless service providers because they consumed too much effort and time of company without being profitable. This created negative publicity for the company on social media as well as created a bad word of mouth, turning away prospects. The decision is still debatable.