It's a never ending debate on how to "onboard" new users with all the growth. Honestly I'd think it would be easier to compare it to email. like a simple look it all works together just get a account and it will federate. It doesn't matter too much where you sign up your account it's able to send and receive email from everyone. But, everyone gets overwhelmed by choices and not knowing the difference between servers. Something like a email app where it gives you a list to pick and a other option would be good imo.