There is limited research on the impact of the vegan diet on the feline companions in comparison to canines. As it is not as well known in the general public that cats can be healthy on a plant-based diet provided with taurine, B12, vitamin A.
Vegan diet:
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https://www.magonlinelibrary.com/doi/abs/10.12968/vetn.2022.13.6.252
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0253292
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0284132
Vegetarian diet:
You may be 100% right in your assessment of the scam. I can’t argue otherwise because you deleted the URL, so you win by default.