I thought there is a MAS rule regarding that? or is it just a norm?
Most of the bigger banks follow ABS's code of consumer banking practice:Clause 5.9: "The Bank may introduce additional terms and conditions governing new features, services and products without giving you any advance notice."
https://www.abs.org.sg/docs/library...l3bd2ab9f299c69658b7dff00006ed795.pdf#page=10
Not sure if there's any enforcement mechanism.

