I followed up on this and had some conversation with one of the Skywalking PMC members.<p>They escalated the situation to the company legal of Byte Dance (the parent company of Volcengine Inc.). Then Volcengine has added an Apache license file for Skywalking. Skywalking is open-source software, it has no commercial license. So nobody knew how to evaluate the impact of this violation. And some people thought it was well resolved.<p>I felt very frustrated about this. It means there is totally *zero* risk to violating an open-source software.