Why it works when you paste it
These arenโt fonts. Each style swaps your letters for look-alike Unicode characters, such as Mathematical Bold, Fraktur or circled letters, so the style travels with the text when you copy and paste it into another app.
Use it with care
Screen readers may read these characters strangely or skip them, and search wonโt match them to normal words. Keep the important words, like your name or your shop name, in plain text somewhere too. Very old devices may show empty boxes.