Even with 100% technical availability (no downtime ever), organizational / legal risks exist. No company can realistically be free of them. Amazon, compared to many smaller companies, may have somehow lower risks of this sort: they are hard to shut down.
If you care about your data really much, you likely have backups and / or mirror copies of it across several providers, in multiple countries, and have a well-tested contingency plan to move a complete copy of your production service to any of 2-3 other providers. (And likely most people don't have your risks and the amount of money enabling this all.)