I swear a lot more irl than I do on here. A lot of a swears value is in the tone you deliver it in, that’s kinda how you communicate which variation/definition of “fuck” you’re actually using, of the huge number of possibilities. This opens up possibilities for humor, expressing subtle (or not so subtle) emotion, etc.
On here, since I lack that fine control, I tend to just revert to using it as an exclamation. And I just don’t do that often, I don’t use exclamation marks very often either.