You still have to pay for it because it costs money to make. But it’s completely open-source beer so you can recreate it yourself if you don’t want to buy it pre-made, or you want to modify the recipe.
I have no idea how to make beer otherwise I’d have a crack at this shitpost myself…
Beer is fairly well solved enough by now that, if you have a good nose and a brew calculator site, you can guess your way to 80% accuracy for any given beer at a first try, and by the time I’ve iterated much further than that, I’ve arrived at something more interesting anyway.
If you’re a company that sells beer, your business model is more based on people’s lack of interest in that creative work than it is around protecting any “secret recipe”.