I disagree with you, future trading is not really easy and it’s kind of risky likewise gambling. You said you are making money from copying trading, but hope you know there are some people that don’t have much knowledge about gambling and they are also making money. The same way trading signals are available, their are also people Providing gambling predictions.
Everyone will have a contrary view and opinion about this controversial topic but the truth remains that future trading is less risky compare to gambling. Future trading involves strategies and analysis which help to minimize it's risk while gambling is purely based on chances. As a future trader, you have control over your fund and you can exit the trade if it decline your prediction but gambling is totally different because once you click on the bet button you have no control over it again until the game is settled either in your favor or against you.
Normally, it's not possible to predict the future perfectly but traders have the advantage of making use of some strategy like economical news, historical data and some other information that aid their prediction and offer traders a better chance of making profit than in gambling.