Part of the reason why is because if it *is* true, then these emails likely came from a hack by Russian intelligence into Burisma earlier this year. The information therefore falls under the same sort of blanket ban on hacked documents being propogated that they implemented this year - it’s what kept the BlueLeaks site from getting retweeted. Twitter can and has been sued before for posting hacked information.
As for why they haven’t talked about it on major media outside of fox, the reason I gave in my points can be added to here - not only is it unverified but also the source is questionable if not flat out illegal. The person writing the article has also only written three articles for the NY Post - only about this. And that person is... a former producer/writer for Hannity. Not to mention the Rudy connection which automatically makes me go “are you serious?”
Without legal proceedings, (which is what’s happening with the trump sexual assault allegations) there’s pretty much no solid way to talk about this whole thing without potentially getting into massive legal trouble later on down the line. Fox doesn’t give a shit as they’ve basically put their entire legal defense into “it’s all entertainment programming not news programming” to dodge lawsuits relating to slander and libel when their hosts intentionally mislead or flat out lie about people. So far it’s worked for them.
That said there was and is other news articles talking about this that isn’t the Post, and are written about the post article in a much more even handed way. The Post is a Murdoch owned tabloid rag and anything they “break” the story on should be taken with a pinch of salt, if not a shipping container full of it when the reporter involved has these sort of connections to the people they’re getting the story from, and are almost 100% trying to push an agenda.
Saying all this and explaining why it’s bullshit though takes more time and effort than a simple retweet and cries of “we owned the libtards”, which is what most of this site does rather than taking a brief second to evaluate sources, motivations, etc. For a bunch of wannabe internet historiographers, kiwis are really bad about trying to keep their personal biases out of trying to determine what’s truth and what isn’t.