I think people are all over this is because of the unfairness. Not just the initial primary injustice of what she did financially but also the subsequent deception of getting the publishing deal for her 'unflinchingly honest' real life personal story.
How many people would love to get a major publishing deal for their first book? It's 'dream come true' stuff. Countless people try, a few succeed, but the number who get the kind of deal she got, with the most prestigious literary publishing house in the country is vanishingly small. And it's a case of hats-off to those who make it, whose work contains that special something that editors and acquisitions teams recognise will make a bestseller.
In her case it was the personal angle and the extraordinary real life experience. The courage of doing what they did in the circumstances they were in with his diagnosis - the sheer sort of fuck-it attitude, with all the ingredients of love overcoming everything, extremes of nature, mild peril and death. That's what transformed it from being a low-level, small advance debut novel like many others, and pushed it to lead-title status, with the artwork, the marketing, the PR campaign that goes along with it.
And now it appears that she made all that up, which means she cheated her way to the top. The golden ticket to bestselling author, major blockbuster film, future lucrative book deals and millionaire status was obtained on false pretences. It goes against all the values of courage, faith, humanity that her book seemed to uphold.