Why the mining centers are located in Netherlands? What are the advantages over other countries?

Well, as it appears, Bitcoin, Ethereum and almost every other crypto is plunging right now, so I'd put my money in http://bitcoinnext.io or http://webwallet.bitcoinnext.io right now. The sudden plunge itself seems to be somehow connected to the recent rumors that trading could be banned in South Korea. And they trade a lot right now.