People can obviously say whatever they want, but my opinion is that substituting curse words makes people sound juvenile and the intent is still the same as the original word. You are still making people do a curse conversion in their heads. So why even bother? Kind of like people who won’t say goddamnit, but they’ll say gawldamnit or something like that. Do you think you’re fucking tricking god? There are plenty of other words that can be used for emphasis.