Poorly advertised is an understatement, I never heard about this within Reddit xD I always thought that it was a third-party thing.

It is indeed similar to the “Local” feed from Lemmy then. However, it doesn’t have the “I’m part of a common family” feeling that I see in an instance like jlai.lu where we know that all users from the instance see the same content.

But TIL, thank you :)