

There don’t have to be any protest songs. The message could be carried by another medium.
I also think right now that there is a period of uncertainty and intimidation going on. No industry wants to step into the limelight speaking up against the magas for fear of direct reprisals from the government or from those who really like it or having their attorneys targeted. So maybe the big kahunas of the music industry are less inclined to publish protest songs when they know an orange sh!tstorm will come their way when they do.
It may also be too early for any protest song to be written, recorded, and to have gained enough traction for anyone to notice.
This question is nonsensical. Let’s say Amazon leaves the EU. What does that have to do with the Fediverse? If all US social media companies left, people will find other forums to engage in. This could be the Fediverse, could be something else that hasn’t been created yet.
In the long run, I think we will all end up on a version of federated social media. The corporate silos will lose their appeal, regardless of where they’re based. Whether this future federated service will be based on Activity Pub or AT or whatever protocol no one knows right now.