They only look instant. Behind the scenes, settlement is taking more time, and if settlement fails, the transaction could be reversed. They do this by taking o

They only look instant. Behind the scenes, settlement is taking more time, and if settlement fails, the transaction could be reversed. They do this by taking on the settlement failure risk, which is exactly what Robinhood does, and is exactly why Robinhood ran into potential trouble when GME became so volatile.