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I hope that, idk when, there will be an exchange that will implement Mt4/MT5 platform in their services. The MT4/MT5 community is huge. If any exchanges wants to use MT4/MT5 platform on their services and did advertise in there, I am sure many forex traders willing to plunge to crypto trading.
The BTC/USD trading feature has been on the MT4 platform since 2018 with a higher level of leverage than common crypto derivatives exchanges. That's the weakness, there's only BTC/USD pair. If there is an exchanges that wants to make a breakthrough by advertising in the forex trader community massively and accompanied implementing their services with platform that has same quality (feature) as MT4/ MT5, i can't imagine how big potential market can get by that exchanges.