[weego]

Link-in-bio comes from social platforms where you're allowed 1 url in your profile but need to show many links (also in situations where some of the links may go to content that could get you banned if placed on site ie OF).

I'm not sure of the value of making it more than it needs to be.

[huesatbri]

And posts with links in them are punished in different ways, like getting suppressed in algorithmic feeds. So instead of just linking to a thing directly people are left with mentioning “link in bio”.