I consider trading as a professional activity. It requires analysis, research and others knowledges. Gambling you just require luck. But yes, maybe there is a thin line between then. It depends on how you do trading.
Though I have never done much trading but surely trading means buying and selling something but gambling is risking money on your decisions.
we never heard from some one that trading is banned in their areas but if we speak about gambling in most of the area we heard that gambling is consider as illegal activity in their area and is banned, and if some one caught playing gambling then he will be charge for it.
Why should be trading be banned?It may sounds like gambling but they do really differ at all and as you said we never heard that trading is being banned on some areas or nothing at all.On gambling industry it really depends on which country do you love in.When we compare trading and gambling they do have similarities on the risk involve but most people will still choose to trade rather than on gambling because making profits on trading is high compared on gambling.