I don't think they'd come to nostr, it has a reputation there as the crypt0bro/Nazis social media. It's assigned as enemy.

I suspect they'd just go back to twitter (tbh the bluesky feed is just left twitter 2014, they just don't like the management). Potentially mastodon.

I wouldn't even have Threads in the running.

I wouldn't even have nostr in the running had you not mentioned it.