Just anecdotally from reading about this stuff online, it's quite hard to do know and very crowded. Apparently alpha (profits uncorrelated with general market m

Just anecdotally from reading about this stuff online, it's quite hard to do know and very crowded. Apparently alpha (profits uncorrelated with general market movements) generating strategies rarely last more than a few months before they stop working. This is why a lot of the hedge funds in this space (de shaw, citadel) actually end up dedicating more to discretionary (human strategies) because quant/automated ones are saturated and can't accommodate large size. But again this is what I've gathered from reading about this stuff, maybe someone with industry experience can chip in