During GST, no charges.

But before GST, there was "prudence tax", RM50 for principal, RM25 supplementary card. Abolished when GST started.

Now back to SST, prudence tax returns, but flat RM25 for all credit card.

Annual fee is charged by the bank, and GST is charged on that.

Prudence tax is directly charged by Kastam.

Correct, if annual fee RM100, Kastam earn RM6 only.

Now Kastam earn directly RM25. Maslan sure happy say see, SST naikkan harga barang, GST turunkan harga barang blabla.

Ultimately it will still cost you, because banks cannot "waive" it. They can offer to pay it for you or offer you cash backs , but still it will come out of your perks
If their perks decrease or gets restricted but they offer a RM25 cash back for spending money RMXX , you know why

Unlikely, LGE considers lowering to RM25 is good deal for taxpayers, half price vs old SST.
Yea, cashback alone can cover cost of prudence tax.

But I got too many cards, I guess need to cancel those not actively used ones