Does anybody know where this exchange is located or how to find out?
According to this:
HitBTC is a Europe based cryptocurrency exchange that began in 2013 and now is operated by HitTech limited, based in Chicago.
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HitBTC Crypto Exchange Review | BestBitcoinExchangeThat platform is classified as a gray platform, or rather, selective scammers.
You will not get much information about their site, almost all platforms that prevent people from the United States from conducting trades are platforms that try to avoid legal scrutiny, and if those platforms do not have a logical reason, they are likely scammers.
good luck