I personally think that Binary Options trading is legal compared to trading Forex. Because in Forex trading, we buy foreign currency to trade (for ex. 1 lot), but in Binary trading, we do not buy anything, we merely predict the movement.
Forex definition: When trading Forex you are speculating that the value of one currency will increase or decrease compared to another, in an attempt to make a profit. For example: The current price of EUR/USD is 1.30850 and you think the price will increase in the future. You buy 1 lot of EUR/USD and wait for the price to increase to the point where you want to close the trade and realize the profit you want.
Binary Options definition: When trading Binary Options you only have to predict if the price of an asset (for example currency pair or stock) will increase or decrease from its current price over a certain period of time. For example: The current price of EUR/USD is 1.30850 and you think the price will be higher in the next hour. So you place a “Call” option on EUR/USD and wait to see its price 1 hour from now. If your prediction is right you can make a profit of 80% of your investment.
Margin
Forex: You can use margin to trade Forex. The maximum margin is determined by each broker, and sometimes can be up to 1:200 or 1:500. Margin allows you to increase your investment capital so you can make a larger trade and make a larger profit if your trade is a winning one.
Binary Options: Margin is not used when trading Binary Options. You can still make a large return on your investment (up to 80% or sometimes 400%), so Binary Options are still very attractive for traders. The good news is that you can never get a margin call.
I read somewhere that one of the reasons RBI has problem with forex trading is using 'margin to trade.' In Binary Options Margin is not used.
But, it will be good if someone legit can make an official statement.