BFAC was another who suddenly popped up. There were a few, with old signup dates and little history, who were downright rabid. I was a fairly frequent poster there, too (Class of '99, 45K+ posts)
There are literally hundreds of election season posters and JR has to know about it yet he allows them to continue. Normally they manipulate and drive conversation in specific directions till the primaries are over then disappear. JR then makes the usual "pragmatic" decision to support the party over all previously expressed positions and things go back to normal.
This time is different because Trump is such a disaster right out of the gate so the election season posters need to stay and take part in the perpetual campaign. Personally I suspect a fair amount of the funding of the site is now coming from PACS and political campaigns. While it may not be illegal, its certainly unethical to withhold it from posters and donors.
Speaking of those PACS that Donald Trump claimed to hate so much, I see the "45 Committee" is running TV ads touting Trump's amazing record of success without actually naming any.
http://45committee.com/