There seem to be ample comments discussing the "viability" of crypto trading/tokens, but if I'm Etrade, all I care about are the commissions - to hell with the underlying tech or what it can/can't do. Not even just for BTC, ETH, EOS, etc now, but for the coins to come in the future. Sure, they can have prolonged periods of low volume (even manipulated volume), but when there's a frenzy (e.g., 2016-2018), I imagine that the profit potential on commissions would do wonders for "shareholder value". Combine that with Etrade's namebrand (as mentioned in other comments) experience, and infrastructure, and you've got a gang of traders that would gladly do away with the sketchy/lesser-known exchanges for Etrade (my opinion).