Much hate here but I love when I can use my nostr extension to SSO. It better work on mobile, too though, which so far is a bit lacking. But then you can bring your profile and people can follow you on nostr ... why not?
Discussion
I think we just need to praise apps that trully go for the Nostr spirit and store everything on relays, which allows for any competing apps to "steal" their user. Apps that only go half way into Nostr in order to keep control over the user are less desirable. But they can still exist.
What about video and large files, bittorrent may fit better for this case. Nostr event for the meta data?