Octafx is a broker for forex trading and as far as I know it is quite trusted, because I see quite a lot of forex traders in my community using this broker, if you are afraid of being scammed then why not search about the exchange first, because if the exchange is trusted then copy the trades they have that are just as reliable.
You have to understand that copy trade will not increase your chances of winning, it's just a way to make it easier for you to trade because you don't need to do any analysis other than following the leads you choose, but of course, you can't be sure of profit because it's impossible for a trader to always make a profit, and my experience with copy trading did not go well as the results were no better than trading on my own.