Also, the ability for users to add a small bio to their profiles in Telegram seems to be a decent idea. It should be 100% optional, editable in the Settings. Their design could look exactly like the description of channels. It could contain links and mentions of other Telegram users/bots/channels.

With usernames, large groups and channels Telegram gradually becomes a more open environment. Every time you stumble upon new users in that environment you might want to learn more about them. That's where bios could help.