Are there real forex billionaires? George Soros certainly thinks so.
Are there real forex billionaires advertising their services on YouTube, Telegram, Facebook, etc? If you think so, I've got a bridge in Brooklyn and some lovely wetlands in Florida I can sell you for an incredibly good price.
A real forex billionaire won't have time to hang our on social media offering service for fees. They can make more in a day than they can make with 10,000 clients paying monthly fees. Fake forex billionaires will charge anything from zero (either to make money on an upsell later or to make you sign up for a broker under their IB link, so they make money whether you win or lose) to insanely large amounts of money for courses, mentoring, and signals that are nothing but a way to suck money out of your wallet and enrich the guy pretending he's already got a billion dollars.
Even at the sub-billionaire level, once your account gets big enough, you need to dump retail forex. Your choices then are an institutional account (only at a
very well regulated broker with a solid reputation or at a licensed bank) or else at a broker licensed to offer exchange traded futures. You can
read what Sive Morton wrote about futures brokers here.
Is it possible to become a billionaire? Yes, but the more money you have to start with, the better your odds. No matter what the fake advertisements say, your chances of making a billion starting with a few hundred dollars are
zero. Also, no one becomes a billionaire overnight. Even with a starting balance of 1 million, making a billion via trading takes decades of disciplined hard work, not years.