Earlier quoted context omitted.
> Corporations don't gain by cancelling their customers. Sure they do. If a certain customer's behaviour is alienating or obstructing other customers, then that customer gets cancelled, because they are having a negative impact (on the business - not the users!) that is larger than the benefit they provide. That's a net positive result. Ignoring your whole concept of "mean", it is 100% up to the company to decide wha…
> If a certain customer's behaviour is alienating or obstructing other customers This is not a random cancellation. There is zero incentive for your phone company to cancel an account in good standing otherwise. The OP said "they'd love to [cancel my account] if they could". Why would a phone company "love" to cancel accounts?
To address your point too though, there are definitely customers that the phone company is required to serve that they would rather not serve, because the costs are higher than the revenue.
Remote rural customers, customers who need accessibility-related support, certain outdated services that people are grandfathered into and don't want to cancel, etc...
And again that's where regulation protects the customer from the corporation that doesn't care about the customer's needs, unless they align with their own needs or are forced to via regulation.