Earlier quoted context omitted.
It doesn't read as emphasis to me. It reads like the person is trying hard not to curse, and they think "crap" is a curse word. It's a little bit adorable, like I'm reading a comment from an obedient child.
I guess you are not from the generation of texters. This how languages work we used to use * as a way to avoid getting censored it over time became a way to curse or give emphasis.
I've never had texts censored by texting providers, they're not supposed to read texts in the first place (at least around here).