Rice ferments at a specific rate, and lower than hops. During Prohibition, this was used in lawmaking to stamp out smaller breweries as only the lower rate was allowed (no mention of how to do so; eg. rice) and thus only the corpo breweries with either the capital to reconfigure their production process or the machines already in place (yes, some already were, and had a direct hand in said lawmaking) survived the era.
Conclusion: Only fascists and idiots drink beaver piss.