Correct. Like power service, which is not paid by the hour or day. Ever get a rebate from the power company for power outages? Have you ever tried to get a rebate from Xfinity when their service goes down for 18 hours? Again such service not paid by the hour or day. (/sarcasm)
Yes, I know what you are saying. In reality less than a dollar of the service time paid for was the service actually unavailable. For some people that downtime was no big deal. I know for my AT&T service I never noticed. For others it was critical. If a service is really critical, then a backup solution should be in place. These systems are in fact fragile and a cable cut, a massive power outage, a tree down, will disrupt these services.