If you're on BlueSky and want to bridge to Mastodon, follow @ap.brid.gy
That's it. Nothing to install, no terms of service to sign, no complicated garbage. If you want to stop, just block @ap.brid.gy
Details here: https://fed.brid.gy/docs
If you want to bridge your account to BlueSky, simply follow this account: @bsky.brid.gy
Why am I encouraging this? Because when BlueSky inevitably goes bad, people there will have friends in the Fediverse to help them move here.