I also think republication should be based on licensing, like Creative Commons licenses. Not very well supported now on the fediverse, unfortunately.
People seem to forget who have come to the fediverse from Twitter is that those platforms have republication terms built into their terms of use. Not the case here!
We have 30 years of weird precedent in Web search, like Google, that's found an uneasy and dynamic balance that seems to appease all sides.