Let s imagine we build all the trading robots to have one server per group of client. That would def work, we probably cant pay for one set of server (for HA) p

Let s imagine we build all the trading robots to have one server per group of client. That would def work, we probably cant pay for one set of server (for HA) per client since we have hundreds, but then all these per client servers have to queue up for the exchange line access which has per country controls (cant move the market more than x %, cant trade x or y stock at z time whatever). So yes in a way, end of the line, the clients must "know abt each other" so we can respect the 13 different law codes. We split by exchange traditionally because it made the most sense when we started 30 years ago in Asia, but... We re more and more splitting clients in groups where we can and allocating them cpu power indeed. I envy the stock market people because while they must handle even higher volume, they can shard per stock itself and have just one jursidiction.