It took me a couple days of reading and browsing around and creating accounts to figure out the fediverse and Lemmy and kbin. Until it actually clicked in my head that I was in one instance, seeing content posted in a community of another instance, commented on by users of even other instances, and how it worked between all that. I wanted to actually understand the mechanism, to better navigate it. Now, it all seems simple to me, but it was all very new for about a week. Also, the connection and federation errors that were happening a lot added to the confusion to a lot of people, I feel.
I am now very excited about the potential of all this. Decentralized networks rock.
Now, I think a random user could just show up and make an account and start enjoying it quickly, just would take some time to find the communities they want content from.