This looks like it only works for buckets you own. Upguard is scanning everyone.

Don't you have to pay for that?

One click away: https://aws.amazon.com/macie/pricing/

"No charge for the first 1 GB processed by the content classification engine After first GB, $5 per GB processed by the content classification engine"

Wow that seems pricey. $5 just to look over a Gig of data with a fancy algorithm?

...data that's already on their servers, to boot!