@thenexusofprivacy@zdl To be clear: I'm not saying Mastodon admins have an ethical obligation to help Threads users.
They have an obligation to do what's best for their users, and by extension for the Fediverse at large.
I claim the best way to help our users and the Fediverse at large is to let Threads federate and be "better than Threads, because no Nazis", so Threads users are incentivized to migrate.
(The degree to which "because no Nazis" is true is a separate question to work on.)