This is a good question! Some possible answers - 1. Infrastructure that is too expensive or too hard to build yourself (eg colocation, low latency data feeds, compute clusters, fpgas) 2. Data that is too expensive or simply impossible to buy (eg historical tick data)https://twitter.com/mobile_mm/status/1373427747901542402 …
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Of course if you are just using price data, or if you are doing well known value/momentum/carry stuff then it is easy to reverse engineer that from your positions. If you are doing something unique I don’t think you ought to be concerned.
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Interesting. Good food for thought.
End of conversation
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