I was going to comment on this but forgot..
My extended family are from Malaysia. There are a lot of Chinese people there (my Dad was Chinese and was born only 200km away from where Wai Wong Ching grew up). The Chinese equivalent of a gary boy or chav is an "Ah Beng" (I am accused of being one sometimes by family members

), and somewhat predictably they have started importing the 500W / 1000W motors/conversions and riding these machines on the streets..
for those of you who have been to SE Asia and seen how mopeds are ridden, I'm sure you can just imagine the opportunities for collisions a widespread adoption of fast and moped-style e-bikes might lead to.. That said I doubt TBH the e-bikes will actually get banned, but simply held to the same standards we have in UK or EU..