When using a small providers or in-house services, every single minute of downtime is an argument to switch to a big centralized monopoly.
But a monopoly downtime is *not* an argument to switch to another provider.
With a centralized monopoly, you can always answer "it is failing for everyone". Your customers will also be affected and will not complain to you. Your manager will not even call the IT people because it is written in every media that "infrastructure everybody use is down".
