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To be fair, it's not an insanely simple concept and it'll take people some time to learn it.
It's a pretty simple concept, they aren't being asked how the programming behind it works.
Bro, I'm on Lemmy, Mastodon, Bluesky, and Threads and I'm not sure I even know what exactly it is and how they talk to each other. I just use the service.
I've got no idea how the stuff works, but you've already said everything a normal person needs to understand what's going on: a bunch of different places that talk to each other.
I mean, you don't really need to know the technical details of how they talk to each other to understand that they do talk to each other, and use it.
Think of it like this: you can use the highways without knowing how asphalt is made.