This "scam" is getting the cart before the horse. This is a bio-gas generator which produces methane. This was used back in the 1800s to heat prairie homes. What you have is basically an enclosed compost pile. this pile, as it decays produces methane this methane can be collected and used. I first saw this some 50 years ago as an experiment done bu the University of Colorado. I think in was in Mother Earth News. It worked then it works now. Be careful who calls something a scam. check your source. If you will search Yahoo for prairie generator plans you will find free instructions on how to build both a methane gas generator and some guys have put out an open source set of plans on Tesla' Generator.
Just because some guy can poke holes in something doesn't make it a lawn sprinkler.
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