One of the largest cryptobank (exchange) is ran by someone who openly praised one of the major ponzi scams, even after it shut down and was known to be a scam. [1]

Said cryptobank is now allegedly using fake orders to buy up significant amounts of BTC (recently a 50,000 BTC order [2]) during market crashes.

[1] https://www.reddit.com/r/btc/comments/6xpddt/as_20m_more_tet...

[2] https://twitter.com/Bitfinexed/status/908718464671641602