phew almost got trick
i don't know why you say Yuanbao is one of biggest chinese exchange.
Volume of Yuanbao looks very small. Same level as Bittrex
https://coinmarketcap.com/exchanges/yuanbao/And if you check with Wiki, you can't even find an article for the exchanger. Of course, you will find a page for Okcoin on Wiki
seem like Yuanbao is just a tiny/unpopular chinese exchanger

Take a look:
https://www.yuanbao.com/coinslol, you shouldn't tell me to take a look when you haven't looked at carefully
their volumes are very low compared to Poloniex. They are just a tiny exchange . Maybe same level or worse than Bittrex
check it carefully. It is CNY not $. When you convert to $, it is very small
look at the BTC section only 323 BTC

LOL Please... Bittrex is by no means a small cryptocurrency exchange!!! Check the numbers for all exchanges...