For some customer it is the right thing for other customers it may not be the right thing.
Every provider will have failures. So the question mostly boils down to does paying for more then 1 region cost more or less then paying for the the lost productivity or revenue of an outage like this.
From some places the most costly things they spend money on is employees. If your whole company comes to a stop for even 1 hour. It may cost more then the engineering effort for multi zone, multi region or multi cloud for your critical environments.
For some customer it is the right thing for other customers it may not be the right thing.
Every provider will have failures. So the question mostly boils down to does paying for more then 1 region cost more or less then paying for the the lost productivity or revenue of an outage like this.
From some places the most costly things they spend money on is employees. If your whole company comes to a stop for even 1 hour. It may cost more then the engineering effort for multi zone, multi region or multi cloud for your critical environments.