They should be raking the cash in, their beers are everywhere and always well stocked too. The marketing is excellent and I know several people who prefer Punk over almost anything else. I know there has been an increasing amount of bad publicity but they should shrug that off.
I definitely remember it being a keg beer at the start of my serious drinking aged 17 in 1977...that coincided with the rise and almost complete takeover by keg beers.
I fondly recall going in to boozers ordering up my fizzy keg beer or newly brewed under licence lager ( Hofmiester, Holstien...
Eventually, it always comes down to money and how much can be made.
https://kmflett.wordpress.com/2020/03/13/private-eyes-analysis-of-crafty-brewers-brewdog/