You need to think strategically about what you put on the cloud, because it's easy to overdo it. The decision inputs for an individual, startup and enterprise are all different.

The cost of getting stuff out of Amazon is very dear. While the statistical likelihood that Amazon will lose your stuff is low, the likelihood of Amazon or a competitor doing something to cause you to rethink your use of AWS (or force you to move) is much higher. Wanting to reduce your AWS costs in the long term is a near certainty.

As vendors move away from perpetually licensed software this gets more important. What happens when a vendor (say Microsoft for strawman purposes) decides that some function that is important to you must interface with Azure, and Azure only? What if Amazon decides upstream network transfers are no longer free? Those sorts of changes can break your business, and vendors like Amazon/Microsoft/Google are fully enabled to change those terms.