I've noticed this in pictures from accross asia, including india, singapore, and myannmar.
This doesn't exist in European or American road signage systems.
Generally, the color of the curb indicates where or not you can park a car there and for how much time. It may also indicate if it is reserved for a dedicated veihcile type.
Not 100% sure in the case of Singapore, but the double yellow lines indicate no stopping.
For places where we are allowed to park on the sides of the roads, there are either lot spaces already allocated and drawn out, or there will be no lines painted on the road.
Double yellow lines in the picture here indicates no stopping at all times, so it would be a little pointless to have the curb indicate no parking again.
The curb might just be for visibility, can't confirm.
I suspect this is a remnant of the British era. Don't quote me on that.
In Belgium we have yellow panted stripes to indicate you're not allowed to park. Similar.
I've skimmed through some Singapore's road guidelines and driver's handbook and didn't find any particular significance of kerb paining, from the context I inferred that striped kerb is painted that way just to be visually distinct, to be noticeable. Significant markings are made on the road alongside the kerb, like those two yellow stripes mean "no parking at all times".
My guess is that it makes it easier for drivers to detect bends in the road, as the stripes are painted at equal widths, so you can visually tell in your peripheral vision when the road is starting to slope a corner.
Same HK and S China, never seen them either. HK makes sense considering the GB influence but I wanted to flex I have been to HK (before the chaos). What an amazing city it was... sobs
Since at least some legitimate answers are already in, I will just say that I've noticed this as well from playing GeoGuessr, and it is definitely limited to only a few countries, I believe mostly in SEA.
In Indonesia, they are painted black and white stripes like that to increase visibility. Heck, Jakarta used to paint them using colorful palette a while back, but recently went back to black and white. I personally prefer them to use colorful paints instead of just black and white, especially in urban areas where everything is grey already.
note: philippines dont have this, only either yellow or red, or yellow with black stripes or just stock default concrete skin (un-painted) or theme town/city color (avenue specific in zamboanga del sur & zamboanga sibugay , idk in zamboanga del norte)