@snarfed.org @activitypubblueskybridge @fedidevs @fediversenews Here's a thought... While it's not a concern for me, I'm seeing a lot of worry from others about wanting opt-in consent for this bridge. Could you consider (either by option or by default) having the bridge send newly-followed users a message through their service saying, basically, "this is an automatic message from Bridgy Fed. <User> wants to follow you from <service> via this bridge. Do you want to allow this?" and offer always, yes, no, and full opt-out options in response. The user who initiated the follow request wouldn't see anything until the newly-followed user responded, and no response would equal a "no" answer.
That, or the first time a user is followed via the bridge, could there be an automatic info message sent to the newly-followed user with instructions on how to opt-out?
Would something like that be doable?