Yeah, I'm not a fan of bridge either. It's tempting, but it means you have some middleman who has to run the bridge. Making a bridge so that it's really usable (bidirectional communication) is extremely complicated.
Discussion
Well right, the Mastodon side of the bridge has to act like any other Mastodon instance, meaning that whomever running it has to have a "moderation" policy (or even no policy, which is a policy in and of itself).
You could (for instance) only relay posts based on your Web of Trust... Which would be a transparent "moderation" policy that you could advertise to both sides of the bridge.
But it's definitely a way to bring in lots of users who care about things other than Bitcoin... 😁