The few plausible accusations leveled so far have all been shown to be false.
A short summary of the ones I've seen:
Accusation: A developer 'slept with journalists for positive coverage'; the 'proof' was that a Kotaku author she slept with gave her game a positive review.
Reality: No such review ever existed. The author she supposedly slept with wrote about her game once, long before either of them ever met (nobody is able to dispute this timeline). Kotaku explicitly denied the accusation and supported this version of events.
Accusation: Victims of these harassment campaigns are faking all the harassment in order to get attention, get money, and somehow ascend to the highest echelons of game development.
Reality: Well even if the original harassment was 'fake' (have fun proving that), there's certainly real harassment now, in part from people who believe the original harassment was fake and want to punish them for it.
Accusation: Involved parties 'sabotaged' a game jam/charity drive for personal reasons/competition.
The only concrete variation of this accusation I've seen is 'The Fine Young Capitalists', a pretty sketchy thing that purports to be a charity game jam for women. Other than their shady business terms for the participants, if it's on the up-and-up it's a nice idea. Continuing on the premise that it's TFYC:
Reality: TFYC is basically a one-man funding campaign to theoretically do nice things. It's not operated by a well-established group with a clear track record. Before continuing, perhaps read this statement by TFYC's operator:
http://www.thefineyoungcapitalists.com/PeaceTreaty
By their own admission: Any actual sabotage was not actually committed by any of the harassment campaign victims, merely an unnamed 'associate'. The 'sabotage' went no further than a link to a publicly accessible facebook page. The damage done to the campaign was largely a result of the operator making transphobic remarks in some sort of interview (this is indirectly referred to in the above post). The harassment victims had nothing to do with it, and the appearance of transphobia is what drove the business partner away and cost them money.
Generally speaking, game development & games journalism are deeply intertwined, incestuous, corrupt industries. But guess what: None of these people are targeting any of the actual sources of corruption in big-budget AAA game development or coverage - many of those are really big, easy, obvious targets. By some incredible coincidence, they're targeting vulnerable minorities working on small game titles or game-related works, many of them women. Some of these targets don't even charge money for their work, making any actual harm from supposed 'corruption' near-zero.