You could really screw with their statistics by regularly changing the contents of that file.
We currently don’t have any overview of our userbase; we don’t even know how many people use Homebrew. More importantly, Homebrew currently only bottles the default options but we know some people use some options that cause the formulae to build from source. If tomorrow we see that e.g. `brew install foo --with-bar` is run by hundreds of people everyday we could start bottling it and saving time to everyone. But right now that’s completely dark; the only insights we have about the usage is people opening issues/PRs.
I'm reminded of when Adblock Plus went sour, and we got uBlock Origin. There are lots of examples of this.