New to Grok, how "safe" is the auto-generated music, like for YouTube?

Hello, guys, I'm very new to Grok, like just yesterday. But already have some free-tier experiences with ChatGPT, Gemini, and Copilot, hence my usage is faster than purely starting from scratch. But with Grok, it's my first time ever having a generated video with quite not-so-simple background music, especially since the other 3 chatbots do not offer free-tier videos at all.

So how "safe" are the auto-generated music when uploaded to YouTube and other social media? Any actual copyright claim or even strike experiences? Second, are they royalty-free? Thanks in advance.