Saw a similar complaint on cohost (too long to fit in a screenshot) https://cohost.org/lexyeevee/post/7224213-empty

Yeah it’s a port to Nightdive’s Kex engine. It wasn’t a literal accusation of a GPL violation, more just being disappointed about seeing open source work being captured into proprietary software.

One of their points that resonated with me was that to get modern levels to work they did have to re-implement Boom features, which were GPL.

YouCANN do anything you want?