A link to…what? The regulation you’re talking about doesn’t exist. Hence why the observable reality exists of major distributors selling beer under the label “craft”.

There are all sorts of regulations around classifications of breweries in the US and the amount of beer they can sell in a year without contracting under a distributor (who is federally certified for all manor or food safety regulations). The major distributors also have branch companies that produce certain “craft” brands and therefore are distributed in small enough quantity to be considered microbrews. But the reality is that small loopholes allow for “craft” to be largely meaningless.

Not sure how things are where you’re at, but in the US at this point actual microbreweries are everywhere. Every neighborhood in a major metro area will generally have at least one, and they all visibly make their beer on site in small batches. There’s a very clear difference between those breweries and the ones that sell their “craft” beer all over the country like Sierra Nevada, Blue Moon, etc. The styles and quality are not particularly different these days as they were in the past.