... or maybe she thought it's an edgy sticker and fits her style?
Idk. But if you really were serious about smashing capitalism, it's kinda irrelevant how much stuff you buy, there's a lot of groundwork to be done, organizing and educating. For all we know, that may be what she's doing in that photo.
If she dressed in rags, owned nothing and was homeless, I fail to see how that would accomplish anything more.
Although I prefer to support local businesses, not a fan of massive corporate chains. My city has dozens of local coffee shops that serve fair trade products. I can walk to a half dozen of them, whether or not I bring my ancient 2011 laptop. But I do love my principles being questioned by smug internet randos so 🖕