Put enough behind those strategies and you're making millions a day.
Until your competitors notice and refuse to trade with you or do the same.
Do you have evidence that someone net a billion in a year making a market on a single name?
This seems to ignore that the effective bandwidth could be so low that the latency is greater than conventional transmission systems like RF. Since scintillation radiation detectors are highly stochastic compared to semiconductor RF receivers, I think it's probable it would take too long to receive the bit with sufficient confidence.
Scintillation detectors don't work like a solid state detector and have worse time characteristics.
The other chain (https://news.ycombinator.com/item?id=23903796) suggested 100 bits per second with a 5% error rate. With the (major) assumptions on that error rate and that you can modify / detect the beam in realtime that gives you plenty to work with.
Of course there is a massive difference between technically possible vs actually implementable.
It’s a very cool idea but I’m skeptical that the market structure supports it.