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Mastodon's official stance on Threads
(blog.joinmastodon.org)
This is a most excellent place for technology news and articles.
ActivityPub is a communication protocol. There's nothing stopping anyone from implementing it and then adding their own 'features'.
Just look at how different companies have implemented the HTML 'standard'. You end up with websites that require specific browsers to run properly. It's gotten better over the past few years, but god damn anyone old enough to remember what a pain it was designing websites in the 90's and working around all of Internet Explorer's shenanigans will tell you it's not a good time.