To me the practical problem with FHE is that, if it costs 20 times doing the equivalent non-encrypted computations, it is cheaper to do it on your premises rath

To me the practical problem with FHE is that, if it costs 20 times doing the equivalent non-encrypted computations, it is cheaper to do it on your premises rather than rent 20x the same computational power from a cloud host, unless the cloud host is able to provide computational power at 1/20 of the cost it has for you (which seems too much to me).