In the wake of Bluesky's hosting and verification of ICE (more info at https://social.growyourown.services/@FediTips/115907813290485171 ), many admins have defederated the Bluesky bridge. If you run your own Fedi server, you can block the bridge by defederating this domain:
brid.gy
This will automatically defederate all the bridge's subdomains as well.
If you're using Mastodon, there are instructions for how to defederate servers at https://fedi.tips/how-to-defederate-fediblock-a-server-on-mastodon