@damon I know the threads you're referring to. Not only have I posted in both, but I've checked some of the profiles of the staunchest "Keep the Fediverse only Mastodon" protesters who clearly gave the impression of not knowing that the Fediverse is more than Mastodon, let alone more than ActivityPub.
Some joined in late October or in November 2022. Second Twitter migration wave.
So no, we aren't talking about the furries who have escaped Twitter in 2018 and made #awoo one of the most popular hashtags on Mastodon.
Had I mentioned all participants in the threads in my posts to give Mastodon just a little bit of Hubzilla's conversation model (remember, you can't follow threads on Mastodon, and Mastodon doesn't tell you about unread comments on posts you've already received), I think I might have caused a mass brick-shitting event by teaching many, many more Mastodon users that the Fediverse is not only more than Mastodon, but more than ActivityPub, and that I was literally writing to them via a Zot6-to-ActivityPub bridge right then.