[runeks]

In my experience, no one has a satisfying explanation for this. Nor why this would affect the USD price of bitcoin.

[tehlike]

Also you can trade among yourself and create the illusion of hot market, suck a lot of people in, and use the funds from these people to stay afloat.

[tehlike]

Bitfinex can become insolvent, which means people cannot cashout their usdt's. Prices may crash.