This doesn't solve the problem of sending Threads a copy of absolutely every bit of activity that happens on the instance. If I'm on an instance that federates with Threads, even if I put them out of sight/out of mind, they still get a copy of everything I do. A lot of people are on the fediverse for privacy reasons, yet here we are with people begging to hand Facebook this data on a silver platter.
"But why hide information that's public? They could just scrape it."
Yes, they could. But a real-time feed of activity is more complete, easier to manage, and doesn't require them to go and build a scraping tool just for this.
If I don't want Threads to have any of my data sent to them, I should be able to choose without needing to leave an instance I've been on for potentially years.
I'm pretty sure Lemmy does? I run my own instance and that's how it works.
Is Mastodon different?