If you can steal something and with very high probability not get caught then there’s seemingly a net benefit. However, if you start to steal regularly the odds you get caught are much higher than the most common probability * the number of times you steal. This is true across a wide range of unethical behavior.
Try to remember you lack perfect information and so can’t accurately judge the odds every time. Thus regularly taking low probability risks to your reputation and chances are you’re going to miss judge some of those risks.
If you don't want to be banned, you're welcome to email [email protected] and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.
But moving past that I think you've missed some nuance on morals (or more generally social norms) - they help prevent the degenerate race to the bottom you're referencing. Its upsetting but pragmatic to nullify relative advantage by engaging in shitty behavior, but if you're frequently justifying behavior by citing hypothetical competitors then you're just shitting the place up for everyone by starting that race.
it's not, in the sense of social darwinian competition.
If i stand to lose money, or have to sacrifice something in order to be "moral" when my "competitor" doesn't and thus gain an advantage towards me, i cannot be moral.
That's why my rule is: if it's not illegal, it's moral.