Because “it’s where people are going” - plus those two are already well known among normies, unlike mastodon/misskey/fediverse. They want a centralized thing.

Funnily enough, during this brazilian exodus, my sister complained that Threads was too “clean”, while bluesky had all the “people with questionable mental stability” and was thus more interesting.

I dunno, I follow some political, rap, and basketball YouTubers and they all use Twitter. I’d much rather them use Bluesky or Threads. I think Mastodon would probably be best but so far, anything’s better than Twitter.