Earlier quoted context omitted.
Comcast was the only available provider at a home I rented years ago. The router arrived and I set it up, only to find that the WiFi range was (literally) a couple of feet a most. The antenna must not have been connected right internally. Comcast Support's response? This must be because I am not on their higher priced plan. You can get faster speeds and longer range if you upgrade! The guy on the phone refused to bel…
I found that after a month of working fine, my packet loss jumped up to 50%. Support recommended upgrading my plan. It seems like they must massively oversubscribe their network then just drop packets based on your tier, with a honeymoon period for new customers so they don't immediately cancel.
Of course the upload continues to be terrible
I use my own modem and router now but this was the case when I "rented" from them as well.