It's not necessarily 'AWS' - for example, maybe you trust AWS but realise they have lots of rack monkeys so you can't trust that everyone in their datacentres is trustworthy. Especially say if you have to run in other regions. Or how about in your own data centres in a big company; do you trust everyone who works in all your datacentres with your most sensitive data?

I trust them more than cops and governments. A "rack monkey" has to be bribed or turned. The government is pre-loaded with creeps who hate me.