Malaysia Airlines have announced that they will impose the same rule: powerbanks are not allowed in checked luggage, are not allowed in overhead bins, must be held on your body or in your hand or in the seat pocket, and are not allowed to be used during flight.
the whole thing makes sense but then how do you enforce that?
Before covid I once accidentally forgot my power bank in my check-in when flying outta Phuket as I was in a major rush. Got stopped at the gate to go down the stairs and take it out of my bag. Was quite impressed with 'em.