"Rochko's decision last year to change the signup process to default new users to mastodon.social highlights one aspect of the conflict of interest hereβ
But you don't even want those who are signing up to the flagship instance by downloading the official app, let's be honest here.
That or you expect them to install & operate fediverse software whilst not knowing anything about the fediverse?
Again with "Mastodon's integration with Threads", it's quite literally Threads wants to use ActivityPub and publish & receive messages with compatibility with Mastodon (and Misskey/Forkeys)
That's legit it. There ain't no "integration" beyond speaking the same protocols the same way, as the protocols were designed to enable.