Perhaps. But if someone cares that much about data access control, they can very easily manage a rack in house (they probably already do), and do the compute on

Perhaps. But if someone cares that much about data access control, they can very easily manage a rack in house (they probably already do), and do the compute on that. Paying someone else to do orders of magnitude more work than strictly needed when you have private enough data to justify just buying a server (again, you already have one) is a very hard sell. It could maybe, possibly be justified if the workload is highly burstable, but... even then, it's hard to come up with numbers that make sense.