Is the slashing of bonus interests for OCBC 360 temporary?

It really depends on the predictable benchmark interest rates. As of writing, SSBs just recorded their record lows.

https://www.businesstimes.com.sg/banking-financ....

This would give rise to the pressure to lower interest rates across risk-free cash holdings. When people aren't spending money, interest rates have to go lower to entice business and spending activity. This would stimulate economic activity and investments due to the nature of inflation. As to the question of recovery - that is anyone's guess. Japan and Europe had negative interest rates pre-Covid, and it does not look like it is going north anytime soon. There is a theory that equity will be the new bond due to very low-interest rates, combined with low inflation, which is something new, and that explains the rise in the equity market.​​​

You savings is their liability,do you think bank like to pay more or reduce as much as they can?