That might be OK, too, because the App Store is really just a GUI front end for apt-get. The problem is that Kodi distributed with OSMC would have to be compiled to take advantage of it, and that means JRE would be “sold” with every Vero 4K+, and that’s what would cost money.
So, there would have to be two versions of the various “mediacenter” packages…one with JRE support and one without, and the second would be an option, not included with sales. Then, the “App Store” could just change a couple of settings on the system (maybe something like pointing to an alternate repository), and the next update would download the JRE-enabled Kodi and all dependencies. Also, two versions are required because JRE takes up a lot of disk space, and it might not even fit on some Pi installs.