A museum piece that still works. Occasionally handy, unnecessary for most people today.
In Telegram's early years you simply couldn't bold a word in a normal message. So the team shipped an inline bot: start a message with its username, then text with asterisks and underscores, and a formatted preview appears above the keyboard. Tap it and the styled message goes out.
These days nearly every client handles formatting natively. Select some text, choose bold or italic from the menu, and many apps even convert asterisks as you type. For everyday chatting the bot is mostly redundant.
Where it still helps: older or stripped-down clients with no formatting menu, and cases where adding a link under a word is clumsy in the app you're using. Some people just prefer writing markup by hand, especially if they keep notes in Markdown and paste from there.
Keep in mind that messages sent through the bot carry a small via label with its name. In a private chat nobody cares, but in a polished announcement it can look a bit messy. It also only understands basic markup like bold, italics and links; spoilers, strikethrough and quotes are a job for your app's own menu.
Toque em uma estrela; dá para mudar o voto depois.
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