Spread XBT vs Future

spread between bitcoin and associated futures tends to move wildly and allows for almost risk-free money to be made (in the long run, the spread will have to bounce back to zero). It's only achievable with bots and a very fast connection to the exchange.
what does this graph mean?
UlrikAUR123 Crypto_wiz
@Crypto_wiz, see description: it's the delta between btc/usd and the June future on Bitmex. It bounces quite wildly (and it shouldn't, in a perfect market).
Crypto_wiz UlrikAUR123
Nice setup !
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