I didn't read maturity from this. I read timidness, conflict aversion, lack of standing up for oneself. Someone touring the world making hundreds of thousands of dollars, demoing your own software and claiming its their own? Violating your license setup, the foundation of OSS? I would have spelled it out as clearly as possible, including the legal implications, spelled out my assumption this person was claiming they worked hard on these tools when instead they did minimal stealing, and either talked about legal follow-up action or financial follow-up action. This is a time where anger, frustration, and being stern are justified.