I thought he went out of his way to emphasize that it's not necessarily big government that's the problem, since full transparency in government would serve to reduce the problem as "not buying the product" does the same in the private sector.
Hundreds of pages of legalese are the de-facto weapon against transparency --- even if you can obtain the documents, it's so boring, timeconsuming and frustrating to read it that it becomes effectively opaque.
It only takes one person to do that to expose it to everyone.
People contribute to open source projects - doing work for free that many would consider mundane. Looking for loopholes would be a lot like debugging.