It took me a little bit to wrap my head around the concept, but it's fairly straight forward. Part of the problem is that when you want to "join lemmy" you're presented with several dozen instances and it's unclear what you're supposed to do. I went through all of the "general lemmy" instances until I found this one which seems to be the most popular. I get that you can access other instances that are federated but that's not immediately clear to the user.

Right now it will probably be like original Reddit where the user base is mostly tech savvy people.

My only concern is that I'm wondering about the viability of federated websites once the user-base of a single instance gets large enough. At that point won't it just be the same problem where there is a massive server usage and therefore needs community support?