The Washington Post, owned by Jeff Bezos since 2013, revealed the Billy Bush tape in early October 2016, and TMZ reported that NBC (a news organization) had been sitting on the scoop for some time. Why? The rumors were that the Clinton campaign was coordinating with the media, and in a historic mistake, moved up the release date to early October.
My understanding is that someone from NBC contacted the Trump campaign about this tape and that the Clinton campaign was going to release days before the election. Trump Campaign wanted to release it ASAP so they could recover from it. The Clinton Campaign didn’t want to be outscooped by the Trump campaign released in early October.