comcast cable tv free channels?

just curious how we are getting free channels? we use to have Comcast tv. recenetly been shut off for billing issues, but when I plugged in my box today I was expecting the basic local channels but im picking up hbo, cinemax... you name it I have every channel, (more than ive ever had even when paying for tv) so whats the catch lmao, I no there not giving me a free trial considering I just got shut off and ive tried other tvs in my house this is the only one getting free channels lol. Is my box malfunctioning giving me free channels? haha