The use case varies but for what it’s worth, most major cellular provider in the US offer fallback Internet plans. Ranges from 10-20 a month depending if you already have a line with them. AT&T has an interesting one where your phone lines hotspot is free and unthrottled whenever your fiber is impacted.
This too depends on which POP/ground station you're landing at.
Maybe less so once the majority of starling satellites are capable of laser communications to route your traffic down to a less saturated ground station.
Or they’re just offline, because their backup batteries only last a few hours, and the gensets for the backhaul have run out of diesel. Iberian blackout last year, I didn’t even know it had happened until I went to pick the kid up from school - just another day at the home office.