Folk-punk and the tradition of the benefit show is something worth understanding as a structural feature of the genre rather than just a nice thing that folk-punk artists do.
Folk-punk artists have been doing benefit shows — raising money for specific community causes, for bail funds, for healthcare costs, for political campaigns — since before I was paying attention to the genre. This isn't incidental to the music; it's connected to the same values that shape the songwriting and the touring approach.
A benefit show is a statement that the music is for something beyond its own existence — that it exists in a community and has obligations to that community. This is a fundamentally different relationship to music than the entertainment model, which is that music is a product exchanged for money.
The artists who do benefit shows consistently are also usually the artists whose music takes political and community stakes seriously. The music and the practice are coherent with each other.