"expected to diffuse rapidly. In the preceding experiments, bacteria were cultured in well-mixed liquid solutions. This mixing thereby promotes cheating, providing perhaps a greater barrier to the spread of the resistance than would actually be encountered by an infection in vivo."
This might explain the structure of our stomach. It mixes food and the bacteria friendly outputs are roughly evenly distributed around the surface, promoting more uniform distribution.
I can't find it off hand, but the paper on it was exploring how populations form in the stomach, apparently it prevents excessive colonizing by one bacteria. Interesting to think it might be a factor of cheating.
I have a hunch that eusociality occurs when resource gradients are concentrated among nodes either by environmental factors, or due to predation forcing it.
Cheating can be viewed as a form of predation in a game theory lens. Super cool.
Big factor for why I care more about the "prebiotics" (read: lactic acid) than the actual bacteria type.