[Spooky23]

Keep in mind that Amazon (and others) uses the "roach motel" model for networking. Easy to check in, not so easy to check out.

When we looked at S3 for some archiving use cases, that came up as a risk -- if strategically it made more sense for us to adopt Google, Microsoft, etc, we would need to negotiate significant concessions from a new vendor to transition away from Amazon or take a hit during that period. You always need to plan for the exit!

You'll have similar issues on-premises (ie. dealing with EMC/etc), but many people forget that cloud providers have their own gotchas too.