Some of the cores are licensed noncommercial, and mass-scale for-profit selling of those cores is part of what Hyperkin did that was so shitty. They also weren’t releasing source code for the GPL cores they were using and were actively denying that it was our (or the upstream authors’) code in the first place.
If you’re just a guy who is getting paid to set up a Lakka installation for a friend or few, that’s not a big deal and we’re not going to jump all over you. If you start cranking them out in mass amounts in violation of licenses, we won’t be happy.
If you’re planning to make a business out of selling Lakka boxes, you’ll have to sell them as “lakka compatible” or whatever and have customers download and install it themselves.