I think a big help to avoid this is if any “official” apps automatically point to something like lemmyverse search or Fediverse Observer rather than Join Lemmy or any single instance.
Mastodon.socialwas already by far the largest before the only app named “mastodon” available in the major mobile repositories was built to automatically have you create an account on mastodon.social to “Make it easier for the normies”.

The fact that I dont’ even know the name of any lead developers of #lemmy as opposed to /u/gargon@mastodon.social is probably a good sign too.