Typically most institutions such as hospitals have multi T1 lines from separate providers. Ignoring piracy/automated systems, sometimes isps just have outages, so it's the same problem.
You might even have crappy situations due to people not understanding what they are buying (or other weird reasons) where 2 ISPs share 1 LEC circuit, e.g. a single physical fiber line.
But anyway, a provider cutting you off permanently is more than an outage. You need to get another ISP.
My hunch is that these accounts would be exempt from certain actions compared to residential accounts.