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Saying that the bridge is nothing more than another ActivityPub instance is very disingenuous.
While it may be built upon the ActivityPub protocol, but its main purpose is to act as a bridge to non-federated platforms, which is unique to that instance. When signing up for a fediverse instance, it should be known to the user that their data will be shared within the fediverse network. But, no permission is given to share on any platforms outside the fediverse network, using non-ActivityPub protocols.
So, no, opt-in should not be necessary for all instances, but in the case of the bridge, it is, because it’s enabling a feature that users haven’t explicitly agreed too and isn’t a core part of the ActivityPub protocol. And since the bridge is being made open-source, should users also be expected to track down any other instances that pick up and use it and manually block and opt-out of those?
Ok, then please tell me, in terms of giving one’s consent, exactly how the two are different?
Because I fail to see how opting out in either case is any way a different process than the other.
The developers are putting the onus on the end user that is affected, and relying on them having knowledge that their product exists. Then it is the users’s responsibility to figure out the process to remove themselves from the user group and trusting the developer/admins to actually take any action to do so.
This is the only argument I am trying to make - opt out is bad. Please stop using it when developing technologies that affect user’s data and/or privacy.