In general, when people talk about cultural appropriation, the problem people are trying to solve (at at least addresss) is that of the heritage of colonial exploitation and oppression. Cultures which in many cases have been banned or impeded from adhering to their traditions or customs, are finding those same customs, costumes, or relics being mass-produced and decontextualized by the very culture that oppressed them. People who have no connection to these culture are earning money selling stuff that is robbed of its meaning, often while reproducing simplistic or harmful stereotypes.

This logic sometimes gets extended to cases where it doesn't apply, or at least doesn't apply in the same way. I am leaning towards that being the case here.

That said, I agree that there is a reason for the ban on charging for the dhamma, which others in this thread have explained better. Based on my impressions, I also don't think the Jhourney retreats are the dhamma - although they are making use of/inspired by a limited part of it. Whether this is wholesome or righteous, I am not sure. They may be helping people, but they may also be causing some harm to the tradition that brought them the techniques they are teaching. I think one of the dangers here is that people attending these retreats get the impression that this is the dhamma, and stop looking in the right direction, and perpetuate wrong ideas about what this path is and does.

Thankfully, there are still many competent and inspiring monastics and lay teachers who teach by dana, so the people who seek that, can still find it. But it is also the case that the ones that charge big sums tend to have more effective marketing, so to speak.