> The work that they're doing to show how genetic features correlate with the observed tastes, behaviors, and propensities of users of the site seems remarkably useful.

Oh man are you going to be upset when we regulate all that out of existence. Trying to correlate genetics to tastes, behaviors, and propensities, while scientifically interesting, is a total political non-starter.

> The FDA is doing exactly what it always does, stifling innovation while justifying its existence using the voluminous laws created by politicians justifying their existences.

This action is the FDA acting within the core of its jurisdiction, and within the core of a law that was passed with tremendous public support. This is not to say that agencies don't do what you're describing, but in this case, it's pretty much the FDA's job to control this sort of "innovation."