jointhefediverse.net seems to be a commonly linked resource for directing people to join the Fediverse.
Curiously, it does not list Lemmy under the list of Reddit alternatives. Their GitHub README explains why.
Previous relevant discussion: https://lemmy.ml/post/78808
Do most people go to jointhefediverse, though? Honest question, I don’t know the site’s traffic stats vs fediverse.to or fediverse.party (which both show up way above jointhefediverse in my duckduckgo search). It’s not like an authoritative index or search engine blackballed Lemmy, it is literally about a single grassroots site.
It’s the first one I always see whenever I look up lists of Fediverse alternatives and I always end up on the site. I use fedidb.org but I don’t use it to find Fediverse software.