What do you mean by 'safe'?
If you want to know how safe the traders are from being scammed, it depends on the brokerage. There is still lots of scam on Forex but the current situation is much better than it used to be a couple of years ago.
If you want to know how safe traders are from losing the money due to unsuccessful trades, they are not safe at all. Forex market is really volatile, so there are many opportunities of earning and losing the money.
If you want to know how safe the traders are from being scammed, it depends on the brokerage. There is still lots of scam on Forex but the current situation is much better than it used to be a couple of years ago.
If you want to know how safe traders are from losing the money due to unsuccessful trades, they are not safe at all. Forex market is really volatile, so there are many opportunities of earning and losing the money.