Yeah, I’m sure a significant percentage are signing up but not staying active. That said, my feed is filled with content from people I follow. They did a great job engaging “influencers” (I hate that term) before the public launch.
First, "reaching out" is different from actually federating completely.
Second, i was referring to lemmy in particular. I know mastodon and lemmy are both part of the fediverse, but lemmy <> threads federation is a different conversation than mastodon <> threads.