I imagine there can be some deals that people don't really want to make public even if they aren't strictly speaking illegal. One such a deal that surfaced som

I imagine there can be some deals that people don't really want to make public even if they aren't strictly speaking illegal. One such a deal that surfaced somewhat recently was that cum-ex trading. If you put that in the public market, you would essentially be killing the goose that's laying golden eggs since there would be outcry to make it illegal. If instead you just offered it to select few (people with enough capital & no moral qualms about using it), you could keep it under the wraps for longer time and get better long term return.