@moseisleydk Regarding licenses for paid apps, see also this forum post:
I’m not the one who decides who gets a free license, I just wanted to make sure that you’re aware that this could be an option.
Also, in case you haven’t fully understood, the “paid” migrator is still open source, you can study, modify and re-distribute it under the terms of the LGPL 2.1 license as the rest of XWiki. It just contains some license checks.