@deadsuperhero Why is interoperability between open protocols "not good"? If you don't want your posts to be public, you can set your profile or posts to not be public. Otherwise, you're posting publicly on the open Web, via an open protocol that nobody needs permission to use or interoperate with.
As a user, you can block bridge accounts, or the whole bridge, the same way you would do it with any other fedi instance.