When you choose to use a cloud (aka someone else's computer), you trust that someone else, because you're no longer in control of what happens to your data once

When you choose to use a cloud (aka someone else's computer), you trust that someone else, because you're no longer in control of what happens to your data once it leaves your device. That's a sane expectation, anyway. But you don't expect your own device to behave against your interests.