@eishiya @byjp you should know that Bluesky, once they start federating (which this is directly related to)... is the fediverse as well.
Please do not confuse Mastodon/ActivityPub with the whole fediverse. The fediverse is a wide array of servers and there are many bridges between different protocols out there already.
And on the topic of consent, this is a purely public system. Consent within the fediverse is opt out, when you post publically you are automatically consenting to anyone receiving and transmitting your post however they wish. If you do not wish to provide that consent, you make your post private.
Bridges are a natural part of federation and are key to it's survival as it makes all relevant platforms less likely to collapse.