Also, I've noticed that sometimes ethbull moves in opposite direction to ethusd. For instance on binance today ethbull is up 21% but ethusdt is actually very slightly down.
It seems like there might be some kind of huge mis-pricing here that could be arbitraged?
arbitrage? Is there something wrong with the price it is listed in other exchange?
You can only do arbitrage if you think you can earn with a high difference between price to both exchange.
Arbitrage will only work if they think they will be @5% or more gap in different exchange.