The biggest reason I've seen for not using cloud providers is regulatory. In the UK, principle 7 of the Data Protection Act makes the collector of data responsi

The biggest reason I've seen for not using cloud providers is regulatory. In the UK, principle 7 of the Data Protection Act makes the collector of data responsible for ensuring downstream security. Unfortunately, most of the big cloud providers won't let themselves be audited, and won't accept strong terms in the contract. Until that happens, they can't safely be used for bulk personal data. (where safely means the data controller is secure from regulatory fine).