Stylised text has been a fixture of social platforms for as long as those platforms have existed, and the reason is straightforward. A plain username is hard to notice and hard to remember, while a styled one looks deliberate. The effect is temporary rather than durable, but it does the job it is meant to do.
How it works
Nothing is being rendered with a special font. The text is converted into Unicode characters that happen to look like the letters, which is why it travels: there is no font to install and no styling to carry, so it survives being copied between apps as long as both support the characters.
That last part is the limitation, and it explains most of the disappointment. Every platform supports a slightly different set, and when one encounters a character it does not have, it quietly substitutes something else. The result is text that looked right on one screen and slightly wrong on another.
Where it works best
Display names, short bios and captions, particularly on the mobile apps where most of this happens. Shorter strings are also safer, because a long line of styled characters has more opportunities to hit a character your target app does not support.
Plain, widely used styles are the safest choice. The more decorative the alphabet, the more likely something in it will not render.
What not to do with it
Do not style a link. Converting the characters breaks the link, because what the link needs to be is the exact original text. This is the most common way styled bios end up with a profile link that no longer works.
Do not use it where the words matter more than the appearance. Search engines do not index styled text usefully, a screen reader will read the substituted characters, and anyone copying it to search for you will not find you. Professional names, company names and anything factual should stay plain.
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Where styled text breaks and why
Every styled alphabet relies on characters that the standard only partly defines, and that is the source of nearly every problem people hit. Some styled letters map to characters that phones render as emoji. Some map to symbols that look identical to a letter but mean something else entirely. And some simply do not exist, so the platform substitutes a different symbol and your carefully chosen handle becomes a different one.
The result is that the same string can look correct on one device and subtly wrong on another, and you have no control over which device your visitor or follower is using.
Two rules reduce the risk substantially. Keep the string short, because every character is another chance to hit something unsupported. And choose styles built from widely supported characters rather than the most decorative option, since the decorative alphabets are exactly the ones that depend on unusual symbols.
There is one failure worth calling out separately: a styled link does not work. Converting the characters changes the text, so the link no longer points anywhere. Profile links in particular get styled by people who did not mean to, and it is one of the most common support questions on social platforms.
Finally, keep anything that needs to be found or understood in plain text. Screen readers announce substituted characters, search does not index styled strings, and nobody can copy your handle and find your account.