Should I be worried?
Nostr feels a bit like Facebook on its early years. You share links, music, jokes, it's friendly etc.
Discussion
The big issue still to be resolved is the data storage and handling. It's costly to store and pipe it around.
When the NostrTok become a thing it's going to get serious soon.
Maybe we store our data on big cloud storage providers like iCloud, GDrive etc. in the future but with our keys and our data? We're already paying for storage with our photos, backups etc.
Just a slightly different model.