Only the very first user to subscribe/search for a new community needs to do this. It’ll just appear for everyone else on that instance from then on.

And the devs are working on a solution to make this happen more automatically.

Segmentation was a problem on Reddit too. Anyone could make a sub with a similar name to compete with another. Users on lemmy will probably slowly gravitate towards one or two big communities for each topic. It’s just early days.