This is not right. It's not even wrong.
The CDP is not "the government". It's a private company owned by the SGX, which is also a private company, and it absolutely is profit-driven - that's why they charge fees for transfers, old statements, etc. etc. etc. etc.
Stanchart is profit driven too, but they don't have any required account minimums. Where on earth did you get that idea?
The first one is probably right, though it depends on how good their execution platform is. The second one is just wrong - Stanchart custody is absolutely fine if you're a smalltime trader.
I got this from experience.
Stanchart is currently trying build their clientele, so they will give promotions and waive fees.
You cannot denial the possibility that one day, they can change their mind to start charging holding fees, which is what most SCB are doing.
CDP, no matter what, cannot anyhow start charging holding fee because of SGX and government intervention.
But Stanchart can just change their mind today, start charging holding fee tomorrow and SGX has no power to stop them because it's not under their jurisdiction.
I'm not saying Stanchart is bad, just that if they are good to you, they can be very good. But one day, they decide to play punk, you are petty much in their mercy.