It's because that's not the bridge, that's a Friendica group about working on such bridges. Friendica supports group accounts that you post to by tagging the group.
Group accounts work by boosting every post that tags them.
The initial post was made to the Fediverse News, Fediverse Developer Discussion, and AP-AT-Bridge Group groups, which is why you'll see them boosting almost every comment throughout this entire thread. Anyone who didn't explicitly removed them from the references is posting to that group as well.
The bridge will not appear as a single account. The bridge will translate accounts through it, so if I made an account named Shiri on the official bluesky server, then followed you through the bridge you would see a follow request from shiri:bsky.social@bsky.brid.gy (name formatting probably will differ slightly), likewise that would be the name that would appear for everything I do through the bridge with your account.
If you wanted to block my specific bluesky account from accessing your account, you could block it as normal and it'll work just the same as it always has.
With # NoBridge in your bio, when I go to look up your account through the bridge I either won't get anything at all as if you don't exist or it'll tell me that you've opted out of the bridge.
@HistoPol @jamie @oliphant @snarfed.org @luca @PCOWandre @chronohart @snarfed