Otherwise I’m in agreement that the instance-selection part of sign-up is a huge barrier, because what instance you choose is actually really important but it’s overwhelming when you’re just getting started.
Point them to lemm.ee, they can move later if they want. The name is neutral and it’s the second biggest
Plus not being able to migrate your account/communities/posts to another instance if yours goes to shit/shuts down/turns out to not fit your needs makes the fediverse feel really unstable.
Can people move their posts from Twitter/Reddit now that they are enshitiffied? This requirement isn’t usually expected from centralized systems, so this should be the same here