Western leftists will always take over stuff like this because to them left=progressive. Anything that is anti-establishment is fodder for them. Doesn't matter what the establishment is, either, the point of progression is that you keep moving, otherwise you are no longer progressive.
That's also why they have gotten more and more extreme. If they find a point where they want to settle down, they can't or they lose their identity. (PL, this is what happened to me, I had very left-wing values and then in the later half of the last decade I saw my peers get nuttier and nuttier. It was a combination of them leaving me behind and me just noping out of it. Traditionally-speaking my views are still quite left wing, but the left we have at the moment would probably call them fascist these days...)
Punk was pro-DIY and anti-corporate before marketing teams saw a way to make a buck or two.
Basically Punk has the weird distinction of being taken over and co-opted by both the commies and the capitalists for their own ends.