What’s going on? Robinhood posted a disappointing first earnings update since its IPO. What does this mean? In Q1/2021, Robinhood’s bank balance might have been boosted by meme stocks (like GameStop and AMC Entertainment). In Q2/2021, however, Robinhood’s revenue surged 131% thanks to crypto trading making up around 51%, which was a huge jump from 17% in…