I kept a blog for ten years, I didn't write down my health info, my contact info, and my financial info on it.
That was my point. It isn't that Mastodon is the alternative to Threads, it's just an alternative. The are plenty of systems of sharing short status updates with people that won't involve as many privacy threats.
And attention is being paid to Threads because yes, the access to health info is unusal. Other social media apps haven't asked for that unless they were specifically fitness apps.
Instagram also collects health info, which it has no intrinsic need for. This is important to note because, fundamentally, Threads is Instagram. That's why it collects the same data.