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
The linked post given on the second point is a bit flimsy. It’s basically saying that if you use evidence published by a person with shitty views, you must have them too. To me, that’s absurd as claiming that referencing FBI statistics makes someone a federal agent.