@BeAware @mttaggart Hmm..
I think a threads post *could* be boosted by a Fedi account that would then be bridged to Bsky via Bridgy Fed.
But I don't think it's possible for a Threads account to bridge themselves to Bsky because up until recently, they haven't been able to follow the @bsky.brid.gy account. And even now, they could only follow it, if that account explicitly responded to one of their posts, which I'm pretty sure hasn’t/won't happen. So still impossible I think…