I don't know if they are out of business but they have recently been removing their just about all of their ATMS from central Bangkok. For example they used to have ATMs at Terminal 21, Tesco at Fortune Town, Big C Ratchada, and Central Praham 9 - All are gone now. I only now know of one AEON ATM not far from where I live - Big C Rama 4 - and who knows how long that will last.