The answer you get depends on the question you try to answer…

“To see Steve Lazarides, Banksy’s former manager, tag his creative genius by staging an unsanctioned exhibit, complete with a souvenir shop, is the greed Banksy graffitied against,” Chapman responded by email. “I can only await his response – and I envision a large mural featuring a rat with a human face.”

‘Art’s uneasy alliance with capitalism’…
‘the greed Bansky graffitied against’!

I gather from Chapman’s words that Bansky has a grudge with greed, not necessarily with capitalism itself.
And I wonder how ‘art’ and ‘capitalism’ may ever enter into an alliance. However uneasy…

Both art and capitalism are, first and foremost, concepts.
On a more practical level, both can be construed as ‘places’.
Art is the place where people so inclined ‘do their thing’.
Capitalism is a social arrangement. The current manner in which most social organisms – nations, in modern parlance – run their economies. Organize the constant exchange between them, nations, and their environment. As well as the economic relations which exist between the individual members of each society.

OK, artists do need to eat… to wear clothes, to use a shelter… Artists are involved in the economic life of the society at large. So artists do have capitalist ties with the rest of the world. Organic ties, not agentic ones. The artists’ need to eat does not depend on their will. Only their greed, in as much as they allow that sentiment to manifest itself.

Which brings us back to Bansky…
I understand from Chapman’s words that Bansky has a grudge against greed!
Which is fine by me…

Some other people, quite a few, have developed a grudge against capitalism itself.
Google ‘anti capitalist art’.
Click ‘images’.
Most of the ideas present there are valid. Many of those yielding a lot of power, a lot of ‘capitalist power’, do behave badly. Are too greedy. Disrespectful. Towards other people and towards the environment.
But should we toss the baby out with the dirty bath water?