Awesome for everyone who made some money. Only problem is possible risk of poloniex going into full maintenance or your transfer jamming. They are not top notch exchange, have problems for years, not to mention atrocious support.
I'll tell you my story with poloniex arbitrage.
In 2017, i was flipping SBD and STEEM on regular basis, binance didn't even have STEEM yet.
I had profitable triangulation in place, using steemit trading API JSON support.
Everything was dandy until i confirmed my withdraw from my email app on phone, while initiating withdraw from laptop on same IP.
This flagged my account.
Result was limbo TX for 2-3 months.
They didn't revert it, they didn't respond, and price erroded a lot during 3 months I waited.
Now, doge isn't worth 5c. Holding doge at 5c is intraday trade at best, and if your doge gets stuck, and you get situation I had, you'll receive DOGE coins in 2 months.
They will probably be below 1c by then. Over 80% loss on your principle sum.