Mastodon founder, Eugen Rochko, praises Threads entry into the #Fediverse because it makes Mastodon “a far more attractive option.”
This is fairly obvious and basic network effects since both Threads & Mastodon become more valuable as their users can now share content across these services seamlessly.
This angers Mastodon admins for whom the fact that not a lot of people use Mastodon was a selling point. They do not want it to grow and be useful to more people.
https://techcrunch.com/2023/12/14/mastodon-founder-touts-threads-federation-saying-it-makes-his-x-rival-a-far-more-attractive-option/