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Have you considered that when threads becomes a fact of fediverse, they will be the ones that dictate how activitypub-based federation is going to go? Most users of activitypub will be threads users and for those that post-threads activitypub users, well behaved communication with threads will become the expectation, even if the misbehaving is caused by threads.
If you don't think so, just consider gmail and chrome as they basically dictate the norms of usage of the open standards.