Delivery of those nines is not a priority. Not for the cloud provider - because they can just lie their way out of it by not updating their status page - and even when they don't, they merely have to forego some of their insane profit margin for a couple hours in compensation. No provider will actually put their ass on the line and offer you anything beyond their own profit margin.

This is not an issue for most cloud clients either because they keep putting up with it (lying on the status page wouldn't be a thing if clients cared) - the unspoken truth is that nobody cares that your "growth & engagement" thing is down for an hour or so, so nobody makes anything more than a ceremonial stink about it (chances are, the thing goes down/misbehaves regularly anyway every time the new JS vibecoder or "AI employee" deploys something, regardless of cloud reliability).

Things where nines actually matter will generally invest in self-managed disaster recovery plans that are regularly tested. This also means it will generally be built differently and far away from your typical "cloud native" dumpster fire. Depending on how many nines you actually need (aka what's the cost of not meeting that target - which directly controls how much budget you have to ensure you always meet it), you might be building something closer to aircraft avionics with the same development practices, testing and rigor.

2. Trusted brand

you might be thinking of durability for s3 which is 11 nines, and i've never heard of anyone losing an object yet