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.

Fullwidth with air between letters — aesthetic captions

Vaporwave spaces fullwidth letters apart (Ｖａｐｏｒ) — the airy aesthetic caption style.

Ｙｏｕｒｔｅｘｔｈｅｒｅ