

It was a feature built in to the web browser, providing a website, file sharing, a music player, a photo sharing tool, chat, a whiteboard, a guestbook, and some other features.
All you needed to do was open the browser and forward a port, or let UPnP do it (since everyone still had UPnP enabled back then), and you’d get a .operaunite.com subdomain that anyone could access, which would hit the web server built into the browser.
This was back in 2008ish, when Opera was still good (before it was converted to be Chromium-powered). A lot of people still used independent blogs back then, rather than everything being on social media, so maybe it was ahead of its time a bit.

Sure, but there’s Linux features that use TPM too, although you probably don’t need them in a home environment.