Ok, let me explain my POV from a different perspective:
By signing up for an account, whether it be on a Lemmy or Mastodon or any other ActivityPub implementation, I have consented to functionality in which my posts are distributed to other instances within the Fediverse. It’s widely advertised and clearly explained that is how things function. I can readily find which implementations are part of the fediverse. And yes, within that system, I can use blocking/unblocking of users, communities, and instances, as a form of moderation that I can manage. But as a common user, I don’t have the option of easily block all instances that use a common ActivityPub implementation, which is why bridges require special consideration. I can’t, in a user friendly way, specify that I don’t want to ever be connected in any way to a bridge instance or any of its incarnations and limit my consent to ActivityPub implementations of my choosing, because that’s something not possible to do do with any other type of instance either. Bridge instances are not comparable to other implementations like Lemmy or KBin, et al, solely because their function is to translate data to other protocols and move that data to other decentralized networks outside and separate from the fediverse, which operate under different rules and policies. As such, they should not be treated like other instances when federating. Or maybe, they shouldn’t even be an instance at all. Making it an instance that can federate may be the easiest way to implement the bridge functionality across multiple ActivityPub implementations, but in doing so, makes it overly obscure to end users.
Without historical knowledge, or going all the way to the ActivityPub docs is there any mention of bridges or even what they do or what they bridge to/from, unless you read through their documentation as well. So, to the common user, we have no knowledge that being able to directly communicate with platforms like BlueSky or Nostr is possible, or is being actively developed, and foreknowledge of this would likely inform some user’s choice in joining the fediverse. Unless this functionality is made common knowledge to the user when they sign up for an instance, or when an instance decides to federate with a bridge, then it should be opt-in, because it’s enabling functionality that users currently are unaware of and may not want. Common users are not notified when their instance federates with other instances, so unless they actively check, they have no idea of changes to the federation of their instance. Right now, there is a very concrete boundary, in that without a bridge, it’s not possible to directly interact with non-federated, separate platforms like BlueSky or Nostr.
This is why people are having an adverse reaction to this whole ordeal, specifically people whom are actively avoiding said platforms. And as I said in my previous post, because the Bridgy developer consciously chose to enact an opt-out policy, specific to their project and outside the norms of other instances, it has been perceived that this is something different that they are trying to force on to people without their consent and behind their backs.
Just because opt-out is the norm for other use cases, doesn’t mean it should be used for all new functionality that is introduced to the fediverse. Besides, there are numerous features across ActivityPub implementations that are opt-in. And telling users that are concerned, just block it if you don’t want it, is frankly a lazy solution, that pushes blame and does nothing to alleviate user concerns or gain trust. Such attitudes drive people away from the fediverse, rather than attract.
I have done my due diligence and read a whole lot of documentation over the past couple of days to better understand ActivityPub and protocol bridges. So my comments are not meant to be taken as I am trying to come off as an expert, because I am far from it. I am just trying to get people to see the other side of the story and at least consider where people are coming from and why exactly they are arguing for opt-in, even if the other side feels like it’s an unfounded overreaction.