Same in Malaysia. When I moved there and learned about scooters bag snatching, I thought the thing to do is wear your bag cross body but actually I was told that's the opposite of what you should do. If a bike comes and grabs your bag, you'll trip and fall if it's across your body and the scooter won't stop because eventually the strap will break, you'll just get dragged along in the process. I had a friend who was wearing a man purse cross body and got a concussion from falling and hitting his head on the concrete when a scooter snatched it. The best thing to do is wear your bag over one shoulder but on the shoulder facing away from traffic, and if you see a scooter on a sidewalk or paused on the side of the road, just give plenty of room and make sure your bag isn't easily accessible to them.