As far as the companies go, their lack of resources is an entirely self-inflicted problem, because they're won't invest in increasing those resources, like more IT infrastructure and staff.
It's the same as many companies that keep terrible backups of their data (if any) when they're not bound to by the law, because they simply don't want to pay for it, even though it could very well save them from ruin.
The crowdstrike incident was as bad as it was exactly because loads of companies had their eggs in one basket. Those that didn't recovered much quicker. Redundancy is the lesson to take from this that none of them will learn.