Collective2 is mentioned in the Forex book “Currency Kings: How Billionaire Traders Made their Fortune Trading Forex and How You Can Too”, by Ben Robson.
I don’t remember the page number because I returned this book to the New York Public Library a while ago and it is currently closed due to the Covid situation.
But anyway, this should surely please Matthew, if he is not already aware of the fact. 
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Under what context is it mentioned? Do you remember?
I vaguely remember that the book was talking about websites that provide auto-trading services, and C2 was one of them.
