Copying GPL code isn't a crime, and some say it's not even ethically problematic. But if nobody is claiming *unattributed* GPL code was lifted from Array's themes, then nobody has anything to whine or complain about at all. Especially if they're doing business focused on providing long term support for their themes. A business like that has nothing to worry about from students and hobbyists with no business model who may be here today, gone tomorrow.