Poloniex is very bad exchange to use.

I joined this market in 2017 and actually experienced months with very shady and terrible technical operations of Poloniex. They did not prepare their infrastructures to meet massive new customer flow into their exchange. Their exchange was super laggy and sometimes even could not access. They arbitrarily put their exchange on maintenance mode without prior announcement/ notification to their customers.

When their customers got access to their accounts, after maintenance, if they had active margin orders, mostly those orders were forcefully closed, accounts were liquidated.

Later, Poloniex was acquired by Justin Sun who is not a man I can trust.