But I was interested in the superstition about luck associated with the color red... In general, if you take not gambling, but, for example, trading, then red is associated with a fall in price, and green - with growth. Since most investors are interested in long-term growth, then for them the color of luck is green, and red is a very controversial color. Therefore, it is unclear why luck is associated with red.
Every colour has its application in all walks of life, red is always associated with anything that has strong emotions, and you would bear testimony that in trading, the emotion of loss is stronger an more intense than that of gains, hence red for loss and green for gains. In the end it is more about psychology than factual implementation.
A funny list of superstitions. I can also add that there is a superstition that you can't calculate your profit in advance and you can't announce your plans to become rich. It's funny, but there are some psychological reasons for this. You become a hostage to your plans and it will be difficult for you to change them, even if the circumstances change.
You are right, and in addition to that when you announce your plans, you tend to expose your plans to competition and victimization even before it's brought to life. for example a company exposing their plans to dominate the market in the presence of competitors. Do you think competitors would just fold their hands and watch you render them obsolete? Of course not, they would do everything in their power to either stay three steps ahead of you or bring up something to neutralize your impact and themselves maintain top position while you wiggle in defeat.
Plans are very good to be a private affair, or shared with a trusted few for finetuning, announcing it publicly is a wrong move on the path to success.