Jane Street's whole business is front running and arbitrage. They make money in a way that's extremely unfair to the point a whole new stock exchange (IEX) was designed to stop it, hurts both retail and institutional investors, and provides no useful service to society.

All they've ever done for anyone but themselves is work on the OCaml ecosystem which is not exactly the biggest or most innovative.

It's a case study here: https://www.youtube.com/watch?v=sl1UQXgtepE I think the critique is implicit so YMMV. Just my interpretation.

YOu're selling your soul for $ and telling yourself that you aren't extracting rents or directly harming retail investors but are just helping the market with price discovery.