Where does this style work?

It works wherever plain text is accepted — bios, usernames and comments — because the letters are real Unicode characters, not a font.

Can I copy it together with other words?

Yes — copy the whole output and paste it next to plain text; every letter stands alone.

Letters with a line through — edits and irony

Strikethrough adds the combining long stroke overlay (U+0336) to every letter — a line through the text for edits, irony and crossed-out usernames.

Y̶o̶u̶r̶ t̶e̶x̶t̶ h̶e̶r̶e̶