Which allow users to connect with others via their own Friendica server,
Wouldn't it be helpful to state that you can also sign up at an existing instance? Or is that less encouraged for friendica? I suppose being so personal that would make sense.
Most software developers aren't interested in being website admins for every Tom, Dick, and Harry. They're building the software for other people to host websites, not to run a social networking site for you.
It's not like the phpBB devs are hosting random car enthusiast websites.
Nobody said they are. However, "a great fediverse alternative to Facebook" does not mean, in the minds of most people who might read it: "you could host a website that would serve as a great fediverse alternative to Facebook."
I think that it's a pretty reasonable assumption that intersection of people familiar with alternativeto and the people interested in seeking Facebook alternatives on the fediverse are also more than capable of spinning up a friendica instance on an rpi