Yes, I also experienced in BTC-Alpha asking too many documents, then rejects it and ask again until you give up. It is quite surprising why still so many people keep using HitBTC despite its many unsolved issues.
Coin Market Cap has liquidity ranking and HitBTC has largest liquidity, larger than Binance. It trading fees are extremely low, lower than Binance. Liquidity and low trading fees are likely to attract big traders there still.