Server indexes of places for newcomers to join can be instrumental for Fediverse adoption. However, sudden rule changes can leave some admins feeling pressure to change policies in order to remain listed.
Little dictators that have too much prominence and visibility are the threats. If a specific start point gets too prominent a lot of users could be redirected from good instances because of the little tyrants that run such a jump on point. Granted it can be easily routes around by offering alternative entry points, but a certain amount of prominence will impact not so Tech savvy users.
And in your assumption you have shown you already understand the fediverse more than a lot of people ever will. They will just join an instance and browse /ALL.
