It was a rumor I heard not long after Wish's release, I tried searching it up but all mentions of activist interference go back to two videos by Film Threat (
1,
2). The fags at Film Threat ramble a lot yet say very little of substance so here's my TL;DW:
They did a negative review of Wish which ended up in them receiving emails written by Disney artists and animators. All of these emails mentioned that the industry veterans were being pushed out by activists who came straight from Tumblr and had no clue what they were doing, and many of the decisions that led to Wish being a failure can be traced back to them, like their godawful attempt at recreating 2D animation using 3D. It's also worth noting that Asha is
described in the artbook as an activist:
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Film Threat never posted any evidence that they were contacted by Disney animators, so take what they say with a grain of salt. Also, none of this directly explains why they rewrote the plot to be worse, but I think
@Incecticyder's theory is likely true, perhaps they wrote that first plot to see what they could get away with and they didn't get away with much.