HashKey Pro was launched in HongKong, it was developed by Xiao Feng and his team of experienced developers. The exchange is no longer active as it had announced in its homepage "From 11 December 2020, HashKey Pro is not available for deposit and trading services across the platform, including without limitation BTC, STX, EOS, ETH, LTC, ZRX, VET, CYB, USDT, USDC, GNT, VEN, and XRP".
Even the exchange had its last post on Twitter in May 2019 and even the Telegram group is no longer active. As a dead exchange, there is no form of trading activity in this exchange which implies that the daily trading volume of the exchange is Zero.
Since the exchange clearly stated its intentions to close down, it cannot be termed as a Scam exchange.