As far as I remember, until Binance became the first exchange, Poloniex was really very cool. Now, from the point of view of generalization, I think that Poloniex should have its popularity and it seems to me that this exchange after it was bought from her has success in any case.
Crypto's growth is very fast and Poloniex is too slow to adapt, this is what makes them lose a lot of opportunities, and I'm sure it's hard to be top 10 if they are still like now.