They treat their employees like a resource to be used, instead of treating them like human beings that need to be cared for. It's apparent that their primary concern is the short term buditary goals, without consideration for impacts on employee wellbeing, customer experience, long term financial impacts or effects on other departments. This greed and selfishness has causes a tremendous amount of chaos and strife within the organization. This chaos is why people get so frustrated with Comcast, and why this Company is so hated.
If you think that Comcast might be a good place to advance, that may not be the case. They use the knowledge of how much you make against you. Someone coming from outside the company will typically make more in a position than an internal promotion because they will just give a flat 10% increase, since they share how much you make with the hiring department. On average they pay less than industry counterparts. Annual raises are typically less that the cost of living and inflation increases, so it's very hard to get ahead in this Company.