I've seen several companies offer a backup internet, e.g. Xfinity has "storm proof wi-fi", which is a battery powered cellular data connection. Eero Pro has something similar.
I can understand the incentive, but it competes with using a phone. It shows there's a market for data all the time!
The Rise of the Stupid Network: a remarkable 1997 essay on what ISPs as dumb bit pipes enables, moving innovation to client devices on the internet, and avoiding the scarcity mindset from when hardware was expensive:
https://www.hyperorg.com/misc/stupidnet.htmlIt's always depressing looking at the SSH logs for my tiny server. I have it appropriately locked down, but it's a sobering reminder of how hostile the internet can be.