Forex.com is "they"
Thats amazing that others have been doing it. I dont know about the others but It seems like you get a better deal with forex.com than if you just opened a commodity account to trade gold and silver. No worries about getting liquidated until you are actually out of money.
I remember back in the 90s in my first commodity trading account, i had 3 contracts of gold or silver and i remember having them liquidate my account because it went below $4,500.
Those were the good ol' days...had to use the phone to make buy/sell orders and online brokerages were just starting to come out, but they were unreliable as everyone was using dial up back then.