@feditips
I think this is primarily a UX problem.
New users that do not know much about how the fedrigeres works, are discouraged from joining at the step of selecting their instance.
The recommendations / discovery of instances does not really help.
I’ve seen this myself.
Offering a default is a good approach - maybe switch the two buttons.
New users should not be driven away - neither because it is not clear ho to continue nor because a necessary focus on diversity.