I have a bit of a different view on it than some people.
Yes, it's clear to see that they shut it down because they are a bunch of fat slobs and it made them butthurt.
However, that it and the other 4 subreddits they shut down were targeted first are symptomatic of a much larger shift in their movement.
They didn't shutdown Coontown. They didn't shut down any of several other subreddits that you would have expected them to have their eyes on.
My theory, based on what I have observed, is that the SJW movement is moving on to newer, more insane pastures.
The crème de la crème of SJWs are all about being fat lazy slobs and being pro-trans and everything that comes with it.
Trans is the hot new progressive issue, and it's leaving gays (gay men of course) and "people of color" in the dust. Gay privilege is picking up steam (who cares if you're gay? you're still white male scum shitlord) and upper-class White women still love to pull out some tears for sympathy points when talking about muh PoC oppression.
But truthfully they don't give 2 shits.
These rich hipster faggots see something much more relatable in trans-whatchacallit activism and considering it some great social movement to overeat and then shame anyone that doesn't do the same.
So, of course, the immediate banned subreddits were>fat people>trans>neoGAF (insane hivemind that has parallels to other rich faggot hipsters)
That's my take on it anyway