nah, there are plenty of truth wannabes (freeze peach bigotry safe havens) that actively federate. just look at literally any competent server’s blocked instances list and you’ll see a few examples. there’s a reason why nobody* runs completely open federation
*: aside from people who’re friendly with that crowd ofc
while i don’t have any specific opinions about this that other people haven’t addressed, i just want to flag up something;
this seems unenforcable. as in, you can’t really tell where someone discovered a post from. yeah you can just remove the buttons from those views clientside and it’ll probably work for the majority of cases, but alternate clients or modifications to lemmy-ui can simply put the buttons back in (or in cases of unmaintained or differently opinionated clients, just not remove the buttons at all). the backend can’t really differentiate which view a vote comes from. federation especially can’t differentiate which view a vote comes from.