It is possible apparently! https://tomkahe.com/@tom/113595942585497989
[@bsky.brid.gy](https://bsky.brid.gy/ ) doesn't have to interact with your account to exist, it just needs to have interacted with *an* account. And [@snarfed.org](https://fed.brid.gy/r/https://snarfed.org/about ) had already bridged his account so Threads is aware of the bridge account