Your point seems to be that capitalism found and rewarded Kim, whereas there may be great artists in noncapitalistic countries that are languishing. Therefore, capitalism is good for art.

But it was the internet that found Kim when he filmed himself drawing on large canvases and put the videos on YouTube, and the internet doesn't operate on old capitalistic principles. The economic status of the internet is unsettled. It sustains the creator economy which has the potential to be something other than capitalistic.

But sure, there may be worse systems for art than capitalism, such as a dystopian dictatorship. That's a pretty low bar for capitalism to pass.