Ah, I see now that I read too quickly - the "open demo environment" was clearly referencing the idea that the vendor (Filevine) would have a live demo, NOT that

Ah, I see now that I read too quickly - the "open demo environment" was clearly referencing the idea that the vendor (Filevine) would have a live demo, NOT that each client wanted an open playground demo account that is linked to a subset of their data (which would be utterly insane).