Meta announced that users on Threads will be able to see fediverse replies on other posts besides their own. In addition, posts that originated through the Threads API, like those created via third-party apps and scheduling services, will now be syndicated to the fediverse.
Definitely not as easily and 100% not legally. I actually don’t think they would scrape stuff off of the fediverse like that because that is just a lawsuit waiting. Besides, scraping is really not feasible when it comes to getting information like that.