poloniex and bittrex are both silent for a long time
What does it mean ? I do not understand your title and its content. Poloniex and Bittrex are old exchanges, and they went through the hype stage. Currently, other exchanges such as Binance, Okex, and Kucoin are the first choices of investors.
maybe the OP's meanings like the poloniex and bittrex exchanges do not have the latest updates or information about crypto market speculations at this time. or I hope I misinterpreted the word. but I agree that Binance, Okex, and Kucoin are the top exchanges and the trading volume there always increases every day.