Complex systems CAN be decoded eventually, some of us been playing the game long time.
Obviously, it depends on the system. Mine can't be decoded. It'd be easier for someone to use the highs and lows of a stock as signals, and then try decoding that. Wait...that is what everyone's been trying to decode.

Anyway ...
I look at it this way, if I took in money from those I know, I am now having to compete with them for my orders to be filled for a lousy 20-30% return? Instead I can toss on more lots and keep 100%, I did not give up parts of life to give gifts to relatives every week, they can spend the years to get decent at this and do it themselves. They will be calling you bad names when your back is turned or just not smile at you as much if you lose a nickel, no I learned long ago, don't let them lease houses from me nor trade money for them. Why add stress to my life. And when they ask how things are going, response is always with that disgusted facial look and say "Things could be better".
I get that. But, it all depends. (On trading results, personality, family dynamics/relationships/personalities/etc./etc.) Your mileage obviously...varied.

Because that was your experience...or everyone you've ever known's experience; doesn't necessarily imply it'll be everyone else's experience.
And if it is...that's how life works.
But I do appreciate the warning.