they did not respond to a request to use the app with screen curtain on.
That's pretty damning. If they can't even demo it while simulating a real world use-case, then that tells me how little faith they really have in their product.
I'm not so sure for PBM, as it's not really a physics thing so much as a therapeutic modality. Do you think it would appeal to physics nerds? I mean, it's amazingly cool that different colors of light applied to the body can have so many varied beneficial effects. And of course a wide range of people would be super interested in that, right?