You'd first have to offer this as a cloud service to consumers. Once de-duplicating storage is something that is legitimately used by arms-length parties, then

You'd first have to offer this as a cloud service to consumers. Once de-duplicating storage is something that is legitimately used by arms-length parties, then you can credibly make the argument that you're using "widely available technologies for data storage minimization" and have a prayer that it would get upheld.