I'm not sure how they hope to contain such a yeast strain. Sure, they can lock it up *now*, but for how long will that last? It'll only take a single corrupt employee, or group of employees, being offered more money than they could ever hope to make in several lifetimes. Then it's out in the wild. Unless they plan on building in some kind of critical vulnerability in the strain, any home brewer can replicate the yeast with ease. Even if they do build in a critical vulnerability, it'll be an "addon" and thus, possible to disable.
I foresee another "War on Drugs" coming, where the objective in unobtainable. Fortunately after the first round of funding, the objective becomes irrelevant ( of course, the cynic in me is YELLING that the objective IS the funding..but I digress ).