I understand on a current technical side why this is not possible, but the post still has some merit in that misuse of original posts can lead to legal action.
Right now, all content posted online is generally accepted as unlicensed, free to use however one pleases, works. This was fine at the beginning, but as the internet grew, control of one’s data increasingly got more difficult to control - once social media became the dominate form of communicating, it was all over.
Early blogs still have copyrights posted on them that, legally, can be enforced and respected. So if each user was able to indicated in meta data their choices, with most defaulting probably to a free license, then there is some level of control returned to the user, regardless of protocol and how things get replicated on servers.
Licenses include reproduction, and the way activitypub works can make that quite murky (its being republished on servers) but that is not all it covers.
OP, I think this is a very interesting topic to discuss, thanks for bringing it up!
I don’t care much for Biden, but I gotta admit, all the policies that could make a significant difference keeps getting blocked by…the republican congress! So yeah, not blaming Biden for the failure of policies and will vote for him