LOL, as if we have time or care what people are doing (as long as they don't show up on risk, we never bother). For example, we have a trader overseas who started 4 years ago. He made a half Million the first year, over a $million the next few years each year. He was going to "retire" and we called him and said "no, you're crazy" ....we advised him to train someone to take over for him, and that account is up well over a $million this year.
To this day, I have no idea what he's doing...never shows up on risk or anything.
We never ask for code from the automated programs. Although we had a trading group that was so thankful for the leeway and leverage we gave them that they cut us in for a percentage of their profits without having to do so, nice people.
We do discourage things that we have been asked about that we know don't work well.
I do agree that it can certainly happen however, I'm not naive. I remember the old days on the trading floor when our old clearing firm would "ask" us to close certain positions, and for some reason a broker would show up in the pit with orders to allow us to close positions....orders from clearing firm.
I actually do think it has something to do with ethics and the Firm you choose to trade with. And, nothing to stop a retail firm from knowing exactly what you're doing since all the trades are run through their computers obviously.
And, please help yourself to whatever the market or our traders can provide for you, we're doing fine, LOL.
All the best,
Don