While searching internet for Bootstrap Studio tutorials, I've noticed that some people showed bootstrapstudio.io/library as an address to access some libraries. Why this link is broken and no longer available?
That library was a website page that "used" to be where we got extra online components that people would share. It's no longer updated nor needed due to the library is now included within the app in the Online Components tab on the top left.
Developers @Martin should then make a placeholder to avoid confusion:
"This page is no longer used - the library is now part of Bootstrap Studio"