I like picking beer company as a fun way to introduce a general audience to the notion of open source and segue into a broader econ discussion. I think a better example though is Tesla freeing up use of their patents for free. Yes there's a cynical reason decipherable (more EVs -> more market) but the way they've done it is pretty open, there's nothing to stop a clever company from competing with them better for being able to use the patented tech. Not having to deal with the lawyers' billables and tying up corporate leaders in legal meetings might be the biggest benefit for them.