There is no such things as getting scammed. Just stupid people.

If they are gonna double your money, then you show 50k, they put in 100k and you make the trade. If they refuse to do it that way, then you don't give them money.

The do a switch at trade?? The you didn't review before confirming. That's a you problem.

You gave something, expecting something in return later?? Again, that's a you problem.

In ALL cases, don't trust anyone, period. Protect yourself before you make an irrational decision.