The linked post shows how most non-tech people’s understanding of email is very very different from most of the people here.
Why on Earth would a newbie join a small instance? How would they even find out about one?
Assuming they search Lemmy, and one of top results is the join-lemmy page (second result for me, below Lemmy.world), the server recommendation tool can suggest small instances with only a couple hundred members. For instance, if one selects Art as the topic and English as the language.