The same investigation found that the Sanders campaign USED the data. And no, it was not proven or even accused that the Clinton camp did the same.
“The DNC fucked up. This mess is their creation.” — no, they didn’t. That is the delusion of Sanders supporters to shift blame away from their failed revolution. Sorry, it sucks to lose but let’s not lie about the reasons why. He did not get enough votes, specifically in the south.