Who trades on metamask?

I created a post awhile ago saying I started to trade here. I'm in metamask and trade on dydx and I'm trying to withdraw from it. I can't so I contacted support. Rep says I need to pay gains tax 10% it comes to $4100. I tried googling it and I got mixed comments about this being legit or scam. I would hate to put 4100 in it if it's a scam. I'm kinda stuck on what to do. I put a post on quaro too to see what others say. I'm trying to take out 14g but I have 42g in it. If it's a scam then there is no 42g but I don't know now. What would you do?

Who trades on metamask?
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