That's a feature of any SaaS. Adobe frequently shuts down ETLA customers due their own invoice processing failures. I can think of three significant government subdivisions that were unable to access any M365 service for 1-10 days as a result of a reseller change.
The real lesson here is that you need to understand the failure domains of the technology your business depends on. Your business is as good as the contracts you rely on. We're relatively good at preparing for IT failure, but not so much the other stuff. For small businesses, key revenue generation could be stopped by an employee doing something dumb with a corporate card.