i lost some bitcion in my trades today , because a shitcoin went down in price 
better to trade with forex by using bitcoin, the swings there, are less severe it's more easy to follow the trend and take profit, there aren't random -300% or something like that
i would advice to trade bitcoin only if you are a part of a group that pump random altcoin
it's harder and you have to think about it way more when you traded with forex.. and for withdraw you need to verify your full identity so upload IDs, passport etc.. it's better to trade on exchanges like yobit, but everything can happen..
this isn't true there are forex like 1broker, which require only a username and email, they are more anon than anything else
you just send bitcoin to their address and start trade after 1+ confirmation
then it's illegal.. every forex broker must be verified and must require to verify the identity.. it can't work without this
if it's only with bitcoin then maybe, but if they accept fiat too it will be down, the question is when