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U can read about the takeover here https://www.ccn.com/circle-acquires-poloniex-focus-crypto-assets-bringing-fiat-pairs/
This is interesting news, but I am not certain if they are good or bad.
Poloniex needs some new blood, that's true. Their support is slow, they need fiat pairs to compete with others, they may need more investments.
But Poloniex was one of the safest exchanges I've been using. If something bad changes in that policy of theirs because of this acquisition it will be unfortunate.
On a bright side, Poloniex knew of this since last year. They announced back then that they will introduce KYC in Q1 2018. Now we know why: because of the fiat transactions. This means that this may be a well-thought step and may be a good one.
I still have a ticket waiting for their answer since 45 days ago. If it'll just get thrown away I won't be too happy...