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.

Wide letters — platform-style spacing

Fullwidth maps letters to the wide forms block (Ａ-ｚ, ０-９) — fixed-width spacing used by East Asian platforms, great for aligned captions.

Ｙｏｕｒｔｅｘｔｈｅｒｅ