Amazon has engineering teams that very few other companies have. Do you think a bank would be able to move out from Oracle like Amazon? I do not think so. Maybe

Amazon has engineering teams that very few other companies have. Do you think a bank would be able to move out from Oracle like Amazon? I do not think so. Maybe they would be able to move to DB2 or SQLServer with the help of the other vendors, so trading a vendor lock in for an other.