Are oil eating bacteria real and if so, why weren't they used for the gulf of Mexico oil spill?
This is just speculation on my part, but that stuff is pretty new, and I'm not sure anyone really knows what the consequences would be of a large-scale deployment. A bacterial bloom of any sort could have serious consequences itself, and things are especially dangerous and unpredictable if it's an introduced species.
And that's assuming that the bacteria can even do its job on the scale required, under the conditions required.