I worry about the development and deployment of bacterias for uses such as these. I know it may sound like chicken little, but who know how they can evolve and what they do once evolved. Eventually, the beer will dry up and then what will they eat. Same with the oil-eating bacteria.
The role of evolution would most likely degrade the traits the bacteria were designed for, once the selective pressure that developed the traits is removed.
It is as if you took some wild horses, bred them to be race horses, then released them into the wild so you could see some really fast ‘wild’ horses. And then you were worried about the faster horses ‘taking over’. Not going to happen. The wild horses that stayed wild are adapted to the wild and will thrive in the wild much more than horses adapted to the race track.