You are very funny to say that investors are gambling using DCA. There is power is accumulating little by little consistently and before you know it will become something big beyond your imagination. El Salvador and Bukele used DCA to accumulate bitcoin and they have a huge bitcoin portfolio currently and in good profit based on the current price of bitcoin.

There are people who don't care about short-term profits but only believe in buying and stacking their portfolio continously not because they want to make profit but because they are seeing bitcoin as a store of value that is worth saving their funds from inflation and also they are saving for the future and not about what they want today.

Trading is more of gambling because as long as you don't sell your bitcoin and you are only increasing and hodli, you are not gambling because your investment is still intact. Microstrategy has bought bitcoin from time to time and he didn't sell but hodli will you call that a dumb idea. Don't regret your actions in future mate because i see that you are only concerned about today.