Big Pharma refuses to believe that the gut microbiome plays a significant role in human health. They either don't take it seriously or think it's so complex that it's not worth working on. I think they're totally wrong and that the microbiome is the arbiter of not only Alzheimers but cancer and other metabolic disorders like T2 Diabetes.
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Regardless of what you believe, the idea that big pharma doesn't believe in gut microbiome playing a significant role in human health is absolutely wrong as easily seen by the rise of GLP-1 drugs (which affect gut microbiome) and are the blockbuster drugs "big pharma" is investing heavily in currently. Perhaps, go take a look at that.