What do they do on the merch and fan interactions? First I'm hearing about this band
I think it was all kind of kicked off by these guys, Cygoodies...
https://instagram.com/cygoodies?igshid=YmMyMTA2M2Y=They create merch, mainly enamel pins, and they are now kinda endorsed by the band. King Gizz's ethos is very much about sharing their art without the greatest concern for their personal profit. They encourage fans to access their music and products, often for free.
For instance they released album Polygondwanaland as a free bootleg and encouraged fans to create their own vinyl and album art and sell it as they wish. They also allow fans to make their own audio recordings of shows and share them as they wish. This has led to some fans (Mystery Jack) attending many, many shows, setting up professional audio equipment, and recording the shows.
I love this approach to their art. It helps that they are super prolific, as they are always churning out new music, and not so precious about it (although I understand why other bands ARE so precious about it).
I have been avidly following King Gizzard on their reddit page, especially during their US tour last year, and a load of fans organised a huge meet up before the first Red Rocks Marathon show. During the meet up fans were sharing all their homemade merch, some really professional, others not so much. Not that it matters, it's the culture they breed and everyone wants to get involved. Obviously some merch was being sold, but there were also loads of people who'd made things like stickers, and were just handing them out for free.
The band seem to be quite active on Instagram and reddit, and seem really gracious of the love they receive.
The last thing I want to commend them on is the acceptance, in their fanbase, of all, not matter your differences. I've read a lot of posts from people in the LGBTQIA+ community, who have talked about how the music has really spoke to them about their journey, and struggles, as well as how the fanbase is really welcoming and not discriminatory in anyway. That's no coincidence, it all stems from the band.