I think you can apply the socioeconomic and derogation lenses here. Socioeconomically, Japan has been ahead of nearly every other Asian country for a long while, with only places like China and Singapore recently catching up to them. So, I think that makes it feel okay. And derogatively, I don’t think these restaurants are successful because they specifically aren’t being run by Japanese people. So that’s good on the front as well. So I’d say, yeah, overall it feels fine. However, I’m not Japanese and don’t have a wealth of additional context that might provide counter arguments.
Sorry for the double reply, but another useful perspective in this is derogation. I often forget this idea because I’m very class minded, but it’s also very important. This is the idea that a culture can be profited off of while simultaneously despising the people that practice it. In practice, this exists as a business around a specific cultural item succeeding specifically because the business is NOT owned/operated by the original cultural group. Some of the best examples of this are around Black American culture in the US. Some cultural products were only valuable AFTER they were owned, operated, and proliferated by White Americans. Which is kinda just Racism Classic™ but allowing certain useful things to cross the cultural line for profits sake.